Reference:1527 - Revision history

Klaudiusz: Remove standalone gallery heading; retain footer gallery

2026-09-29T05:25:32Z

Remove standalone gallery heading; retain footer gallery

← Older revision		Revision as of 05:25, 29 September 2026
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	See also the [[Reference:prince\|Prince family index]], [[Reference:Movements\|movement reference]], [[Reference:Bracelets\|bracelet & clasp guide]], and [[Reference:Serial-numbers\|serial numbers by year]].		See also the [[Reference:prince\|Prince family index]], [[Reference:Movements\|movement reference]], [[Reference:Bracelets\|bracelet & clasp guide]], and [[Reference:Serial-numbers\|serial numbers by year]].

	~~== Gallery ==~~

	<gallery mode="packed" heights="180">		<gallery mode="packed" heights="180">

Klaudiusz: Deep movement, auction and image-layout follow-up

2026-09-29T01:08:41Z

Deep movement, auction and image-layout follow-up

← Older revision		Revision as of 01:08, 29 September 2026
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	\|-		\|-
	\| movement		\| movement
	\| ~~Aegler~~ 7½′′′ T.S. 300, ~~the same T.S. 300 family deployed in 1490~~ Ultra Prima ~~examples~~		\| Shaped Prince movement; catalogues use 7½′′′ T.S. 300, Extra Prima, or Ultra Prima labels
	\|-		\|-
	\| movement grades		\| movement grades
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	\| jewels		\| jewels
	\| 15, 17, or 18 are reported in catalogues; verify against the movement		\| 15, 17, or 18 are reported in catalogues; verify against the movement
	\|-
	\|-		\|-
	\| chronometer dial designation		\| chronometer dial designation
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	* Silvered duo-dial with painted Arabic numerals and "ROLEX PRINCE" + "CHRONOMETER" or "Officially Certified Chronometer" or "Observatory Quality" text, the wording varies with the individual movement and dial.		* Silvered duo-dial with painted Arabic numerals and "ROLEX PRINCE" + "CHRONOMETER" or "Officially Certified Chronometer" or "Observatory Quality" text, the wording varies with the individual movement and dial.
	* Silvered duo-dial with applied baton hour markers, appears on dressier 18K solid-gold examples.		* Silvered duo-dial with applied baton hour markers, appears on dressier 18K solid-gold examples.
	* Cooke & Kelvey Calcutta retailer-double-signed dial, Sotheby's GE1301 2013 lot 87, ~~the only~~ documented retailer double on a 1527. The lot provides individual evidence of Calcutta retail provenance.		* Cooke & Kelvey Calcutta retailer-double-signed dial, Sotheby's GE1301 2013 lot 87, a documented retailer double on a 1527. The lot provides individual evidence of Calcutta retail provenance.
	* ~~Eight-position-adjusted~~ "Officially Tested in Eight Ways" ~~dial designation, Ultra Prima examples carry this text~~ in place of the standard "Chronometer."		* One Ultra Prima example is catalogued with "Officially Tested in Eight Ways" in place of the standard "Chronometer" wording; this is lot-specific evidence.
	* The cited record contains no confirmed Bucherer, Beyer, or Eaton 1/4 Century 1527.		* The cited record contains no confirmed Bucherer, Beyer, or Eaton 1/4 Century 1527.

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	\| Antiquorum May Mondani (108/33)		\| Antiquorum May Mondani (108/33)
	\| 18K white + yellow with bamboo bracelet, 1931		\| 18K white + yellow with bamboo bracelet, 1931
	\| CHF 27,140 ~~(corpus high)~~		\| CHF 27,140
	\|-		\|-
	\| 2006		\| 2006
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	\| 2008		\| 2008
	\| Sotheby's NY Time Museum (N08474)		\| Sotheby's NY Time Museum (N08474)
	\| stainless steel ~~(only documented stainless)~~		\| stainless steel
	\|,		\|,
	\|-		\|-
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	See also the [[Reference:prince\|Prince family index]], [[Reference:Movements\|movement reference]], [[Reference:Bracelets\|bracelet & clasp guide]], and [[Reference:Serial-numbers\|serial numbers by year]].		See also the [[Reference:prince\|Prince family index]], [[Reference:Movements\|movement reference]], [[Reference:Bracelets\|bracelet & clasp guide]], and [[Reference:Serial-numbers\|serial numbers by year]].

			== Gallery ==

			<gallery mode="packed" heights="180">
			File:Ref 1527 hero.webp\|Whole-watch view
			File:Ref 1527 movement.webp\|Movement bridge and markings
			File:Ref 1527 dial.webp\|Duo-dial and subsidiary seconds
			</gallery>

	== Sources ==		== Sources ==

Admin: Deep correctness and anti-slop audit: Reference 1527

2026-09-22T15:40:05Z

Deep correctness and anti-slop audit: Reference 1527

Show changes

Admin: Batch 30 anti-slop prose audit and heading cleanup

2026-09-22T04:30:38Z

Batch 30 anti-slop prose audit and heading cleanup

Show changes

Admin: Prose review: remove research commentary, inflated claims and repetitive phrasing

2026-09-12T04:28:03Z

Prose review: remove research commentary, inflated claims and repetitive phrasing

Admin: Metadata fix: image_alt now matches the actual hero photo (14K white+pink gold, not 18K white+yellow) — consistency fix following the hero image swap, not a prose edit

2026-09-07T12:44:11Z

Metadata fix: image_alt now matches the actual hero photo (14K white+pink gold, not 18K white+yellow) — consistency fix following the hero image swap, not a prose edit

← Older revision		Revision as of 12:44, 7 September 2026
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	\|keywords=Rolex, Prince, 1527, 1527 M, Railway, Chemin de Fer, stepped, Art Deco, Aegler, T.S. 300, Ultra Prima, Extra Prima, vintage, bicolor, Mondani, reference guide		\|keywords=Rolex, Prince, 1527, 1527 M, Railway, Chemin de Fer, stepped, Art Deco, Aegler, T.S. 300, Ultra Prima, Extra Prima, vintage, bicolor, Mondani, reference guide
	\|image=Ref 1527 hero.webp		\|image=Ref 1527 hero.webp
	\|image_alt=Rolex Prince Railway 1527 ~~18K~~ white and ~~yellow~~ gold stepped case		\|image_alt=Rolex Prince Railway 1527 14K white and pink gold stepped case
	\|type=Article		\|type=Article
	\|og_type=article		\|og_type=article

Admin: Add dial and movement images from verified Antiquorum Monaco 2019 lot 173 (same source as new hero) — placed in Dial layout and The movement sections

2026-09-07T04:57:36Z

Add dial and movement images from verified Antiquorum Monaco 2019 lot 173 (same source as new hero) — placed in Dial layout and The movement sections

← Older revision		Revision as of 04:57, 7 September 2026
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	==The movement==		==The movement==

			[[File:Ref 1527 movement.webp\|thumb\|right\|240px\|alt=Rolex Prince 1527 movement bridge stamped Rolex Chronometer Timed 6 Positions 18 rubies\|1527 movement, bridge stamped "ROLEX CHRONOMETER TIMED 6 POSITIONS," 18 rubies — Antiquorum Monaco, 16 July 2019, lot 173 (case no. 49767)]]
	The 1527 runs on the same Aegler 7½′′′ T.S. 300 family that powers the upper-tier 1490 and 971 examples. Cal. 350 — the standard 1490 caliber — does not appear on 1527 cases in the auction record; the 1527 is consistently catalogued with the T.S. 300 designation. Movement grading divides into Extra Prima (the dominant grade, 17 jewels, 6-position adjustment, "Chronometer" dial designation) and Ultra Prima (rarer on 1527, 18 jewels, 8-position adjustment marketed as "Officially Tested in Eight Ways," "Officially Certified Chronometer" or "Observatory Quality" dial designations).		The 1527 runs on the same Aegler 7½′′′ T.S. 300 family that powers the upper-tier 1490 and 971 examples. Cal. 350 — the standard 1490 caliber — does not appear on 1527 cases in the auction record; the 1527 is consistently catalogued with the T.S. 300 designation. Movement grading divides into Extra Prima (the dominant grade, 17 jewels, 6-position adjustment, "Chronometer" dial designation) and Ultra Prima (rarer on 1527, 18 jewels, 8-position adjustment marketed as "Officially Tested in Eight Ways," "Officially Certified Chronometer" or "Observatory Quality" dial designations).

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	==Dial layout==		==Dial layout==

			[[File:Ref 1527 dial.webp\|thumb\|right\|240px\|alt=Rolex Prince 1527 silvered duo-dial Rolex Prince Chronometre sub-seconds at six\|1527 dial removed from the case, silvered duo-dial reading "ROLEX PRINCE" / "CHRONOMETRE," sub-seconds at six — Antiquorum Monaco, 16 July 2019, lot 173 (case no. 49767)]]
	The 1527 carries the standard Prince duo-dial: hours and minutes in the upper register with the typical hour numerals and minute track, sub-seconds at six. Documented dial configurations:		The 1527 carries the standard Prince duo-dial: hours and minutes in the upper register with the typical hour numerals and minute track, sub-seconds at six. Documented dial configurations:

Admin: Hero caption fix: new landscape hero (Antiquorum Monaco 2019 lot 173) is 14K white+pink gold, not the prior 18K white+yellow lot the caption described

2026-09-07T04:54:56Z

Hero caption fix: new landscape hero (Antiquorum Monaco 2019 lot 173) is 14K white+pink gold, not the prior 18K white+yellow lot the caption described

← Older revision		Revision as of 04:54, 7 September 2026
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	<div class="rp-lead">		<div class="rp-lead">
	[[File:Ref 1527 hero.webp\|thumb\|center\|640px\|alt=~~18K~~ white + ~~yellow~~ gold stepped Railway case (Antiquorum ~~Geneva 2005~~ lot ~~100~~)~~, silvered duo-dial "ROLEX PRINCE / CHRONOMETER"~~\|~~18K~~ white + ~~yellow~~ gold stepped Railway case (Antiquorum ~~Geneva 2005~~ lot ~~100~~)~~, silvered duo-dial "ROLEX PRINCE / CHRONOMETER"~~]]		[[File:Ref 1527 hero.webp\|thumb\|center\|640px\|alt=14K white + pink gold stepped Railway case on its strap, two-tone silver and gold dial with off-center hours and minutes and sub-seconds at six (Antiquorum Monaco 2019 lot 173, case no. 49767)\|14K white + pink gold stepped Railway case on its strap, two-tone silver and gold dial with off-center hours and minutes and sub-seconds at six (Antiquorum Monaco 2019 lot 173, case no. 49767)]]
	</div>		</div>

Klaudiusz: Text audit: strip negation-pivot constructions (rather than / X, not Y) from prose per Slop Cop checklist

2026-09-07T04:51:04Z

Text audit: strip negation-pivot constructions (rather than / X, not Y) from prose per Slop Cop checklist

Admin: Layout: restore the original lead caption

2026-09-06T22:58:32Z

Layout: restore the original lead caption

← Older revision		Revision as of 22:58, 6 September 2026
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	<div class="rp-lead">		<div class="rp-lead">
	[[File:Ref 1527 hero.webp\|thumb\|center\|640px\|alt=~~Rolex 1527~~\|~~Rolex 1527~~]]		[[File:Ref 1527 hero.webp\|thumb\|center\|640px\|alt=18K white + yellow gold stepped Railway case (Antiquorum Geneva 2005 lot 100), silvered duo-dial "ROLEX PRINCE / CHRONOMETER"\|18K white + yellow gold stepped Railway case (Antiquorum Geneva 2005 lot 100), silvered duo-dial "ROLEX PRINCE / CHRONOMETER"]]
	</div>		</div>

← Older revision		Revision as of 04:28, 12 September 2026
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	</div>		</div>

	The 1527 is the Railway Prince. The case steps inward from the lugs in machined bands of solid gold, alternating white with pink (the canonical pairing) or white with yellow on rarer examples, producing a profile that read in the late 1920s and 1930s as obviously locomotive-inspired Art Deco. Each step is a discrete piece of solid 18K gold machined into the case itself, which makes the construction structurally distinct from the smooth bicolor 971A "Tiger Stripe" and visually distinct from every other Prince reference. The duo-dial layout is the standard Prince architecture — hours and minutes upper, sub-seconds at six — and the movement is the Aegler 7½′′′ T.S. 300 in Extra Prima or Ultra Prima grade. Production runs from a documented 1931 Mondani example into the 1940s, with a steel + gold-filled Bonhams 2006 lot anchoring the late-production end. The reference ~~is genuinely rare in the modern~~ auction ~~record~~ — fewer than fifteen distinct lots in the public auction record across the past three decades, comparable to the 971 in stepped-bicolor form rather than to the more common 1490. The collector watchmaker watch-guy.com calls it "the only rectangular Prince worth having."		The 1527 is the Railway Prince. The case steps inward from the lugs in machined bands of solid gold, alternating white with pink (the canonical pairing) or white with yellow on rarer examples, producing a profile that read in the late 1920s and 1930s as obviously locomotive-inspired Art Deco. Each step is a discrete piece of solid 18K gold machined into the case itself, which makes the construction structurally distinct from the smooth bicolor 971A "Tiger Stripe" and visually distinct from every other Prince reference. The duo-dial layout is the standard Prince architecture — hours and minutes upper, sub-seconds at six — and the movement is the Aegler 7½′′′ T.S. 300 in Extra Prima or Ultra Prima grade. Production runs from a documented 1931 Mondani example into the 1940s, with a steel + gold-filled Bonhams 2006 lot anchoring the late-production end. The reference appears rarely at auction — fewer than fifteen distinct lots in the public auction record across the past three decades, comparable to the 971 in stepped-bicolor form rather than to the more common 1490. The collector watchmaker watch-guy.com calls it "the only rectangular Prince worth having."


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	==Where it sits in the line==		==Where it sits in the line==

	The 1527 sits in the same straight-sided Classic Prince family as the 1862 — neither carries the flared Brancard profile of the 971 or 1490 — but the stepped case treatment is unique to the 1527 within the Prince catalog. The reference launches in 1930 (per the Antiquorum May 2006 Mondani lot 108/33 explicitly dated "Made in 1931," and earlier Antiquorum Vicenza 1992 lot 146 dating one example to 1930) and continues into the 1940s, with the Bonhams NY 2006 lot 15217/9 documented as a 1940s-dated steel + gold-filled example. The ~~brief framing of~~ 1935 ~~launch found~~ in some collector summaries ~~is not supported by the primary auction-catalog evidence; revise to 1930~~.		The 1527 sits in the same straight-sided Classic Prince family as the 1862 — neither carries the flared Brancard profile of the 971 or 1490 — but the stepped case treatment is unique to the 1527 within the Prince catalog. The reference launches in 1930 (per the Antiquorum May 2006 Mondani lot 108/33 explicitly dated "Made in 1931," and earlier Antiquorum Vicenza 1992 lot 146 dating one example to 1930) and continues into the 1940s, with the Bonhams NY 2006 lot 15217/9 documented as a 1940s-dated steel + gold-filled example. The auction dates place the reference before the 1935 introduction given in some collector summaries.

	The 1527 is contemporary with the 971 / 971A, the 1490, and the 1862. Its ~~position in that group is the visual extreme — the~~ stepped sides ~~give~~ the ~~case a profile that even a casual observer can identify at arm's length~~. The 971A "Tiger Stripe" is a flat-sided Brancard with bicolor gold ridges that read as smooth bands across a continuous case; the 1527 takes that bicolor concept and reorganizes it into a stepped construction where each metal band is a separately-machined piece of solid gold occupying its own physical step. The Watchprosite collector record describes a transitional 971-case variant — "facetted or stepped striped Prince where the two tone gold is separated by ridges rather than being smooth" — that bridges the 971A to the 1527 and ~~reinforces the read that the 1527 is the bicolor experiment's endpoint~~.		The 1527 is contemporary with the 971 / 971A, the 1490, and the 1862. Its stepped sides distinguish it from the other references. The 971A "Tiger Stripe" is a flat-sided Brancard with bicolor gold ridges that read as smooth bands across a continuous case; the 1527 takes that bicolor concept and reorganizes it into a stepped construction where each metal band is a separately-machined piece of solid gold occupying its own physical step. The Watchprosite collector record describes a transitional 971-case variant — "facetted or stepped striped Prince where the two tone gold is separated by ridges rather than being smooth" — that bridges the 971A to the 1527 and resembles aspects of both designs.

	The 1527's commercial fate is harder to pin down than the 1490's. Friedberg's 2001 Timezone article gives the 1527 a single caption-level sentence; Rolex Magazine's 2017 history mentions the Railway nickname briefly without dating the production end; Hodinkee, Monochrome, Fratello, Worn & Wound, Le Monde Edmond, and the major editorial outlets carry no dedicated 1527 feature. The reference's record runs through auction catalogs almost exclusively — Antiquorum carries the deepest 1527 trail with at least four lots over 1992–2006, and Sotheby's, Christie's, Bonhams, and Artcurial fill out the rest~~. The thin editorial coverage is itself a load-bearing fact: the 1527 is rare enough that the magazines that cover the Prince family treat it as a footnote even within the Prince story~~.		The 1527's commercial fate is harder to pin down than the 1490's. Friedberg's 2001 Timezone article gives the 1527 a single caption-level sentence; Rolex Magazine's 2017 history mentions the Railway nickname briefly without dating the production end; Hodinkee, Monochrome, Fratello, Worn & Wound, Le Monde Edmond, and the major editorial outlets carry no dedicated 1527 feature. The reference's record runs through auction catalogs almost exclusively — Antiquorum carries the deepest 1527 trail with at least four lots over 1992–2006, and Sotheby's, Christie's, Bonhams, and Artcurial fill out the rest.

	The Prince does not return to the Rolex catalog until the 2005 Cellini Prince revival, which sits on a different platform and is not part of the vintage Prince story this page covers.		The Prince does not return to the Rolex catalog until the 2005 Cellini Prince revival, which sits on a different platform and is not part of the vintage Prince story this page covers.
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	==The case — solid stepped gold==		==The case — solid stepped gold==

	The ~~1527~~ case is the ~~structural anchor of the reference~~. Each step is a discrete piece of solid gold machined into the case: the white-gold strip is solid 18K white gold (or 9 ct on Glasgow-imported examples), the pink-gold strip is solid 18K rose, and the steps are joined at the case body with the bicolor pattern integral to the construction. A 1527 case cut in cross-section shows alternating gold colors running solid through the full thickness of the case wall. This is the canonical authentication tell: a stepped Prince whose bicolor sides reveal a base metal under the gold layers in any wear-revealed spot is not a 1527 in any meaningful sense. Modern fakes rely on plating; period-correct construction does not.		The stepped case defines the 1527. Each step is a discrete piece of solid gold machined into the case: the white-gold strip is solid 18K white gold (or 9 ct on Glasgow-imported examples), the pink-gold strip is solid 18K rose, and the steps are joined at the case body with the bicolor pattern integral to the construction. A 1527 case cut in cross-section shows alternating gold colors running solid through the full thickness of the case wall. This is the canonical authentication tell: a stepped Prince whose bicolor sides reveal a base metal under the gold layers in any wear-revealed spot is not a 1527 in any meaningful sense. Modern fakes rely on plating; period-correct construction does not.

	The case body measures approximately 23 mm × 42 mm with horns. Documented examples cluster in two slightly different proportions: a shorter form (1527 case 16038, EveryWatch examples) and a longer form (Antiquorum 108/33 Mondani 1931). Bonhams typically measures bezel only and Antiquorum measures to the horn ends, which accounts for the dimensional split without implying two distinct case sizes. Glasgow / Edinburgh import hallmarks appear on the 9-carat examples and date the case import precisely; the Bonhams 2026 sale 31977 lot 25 (18K white + pink) and lot 29 (two-color 18K) carry British hallmarks consistent with imports through the 1930s.		The case body measures approximately 23 mm × 42 mm with horns. Documented examples cluster in two slightly different proportions: a shorter form (1527 case 16038, EveryWatch examples) and a longer form (Antiquorum 108/33 Mondani 1931). Bonhams typically measures bezel only and Antiquorum measures to the horn ends, which accounts for the dimensional split without implying two distinct case sizes. Glasgow / Edinburgh import hallmarks appear on the 9-carat examples and date the case import precisely; the Bonhams 2026 sale 31977 lot 25 (18K white + pink) and lot 29 (two-color 18K) carry British hallmarks consistent with imports through the 1930s.
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	The 1527 runs on the same Aegler 7½′′′ T.S. 300 family that powers the upper-tier 1490 and 971 examples. Cal. 350 — the standard 1490 caliber — does not appear on 1527 cases in the auction record; the 1527 is consistently catalogued with the T.S. 300 designation. Movement grading divides into Extra Prima (the dominant grade, 17 jewels, 6-position adjustment, "Chronometer" dial designation) and Ultra Prima (rarer on 1527, 18 jewels, 8-position adjustment marketed as "Officially Tested in Eight Ways," "Officially Certified Chronometer" or "Observatory Quality" dial designations).		The 1527 runs on the same Aegler 7½′′′ T.S. 300 family that powers the upper-tier 1490 and 971 examples. Cal. 350 — the standard 1490 caliber — does not appear on 1527 cases in the auction record; the 1527 is consistently catalogued with the T.S. 300 designation. Movement grading divides into Extra Prima (the dominant grade, 17 jewels, 6-position adjustment, "Chronometer" dial designation) and Ultra Prima (rarer on 1527, 18 jewels, 8-position adjustment marketed as "Officially Tested in Eight Ways," "Officially Certified Chronometer" or "Observatory Quality" dial designations).

	~~The grade ratio reverses the 1490 pattern. On 1490 examples,~~ Extra Prima ~~dominates and~~ Ultra Prima is the ~~upper-tier outlier~~. ~~On 1527 examples, the same Extra Prima dominance holds but the absolute count of~~ Ultra Prima 1527s is smaller ~~because the~~ 1527 ~~itself is rarer than the 1490 by an order of magnitude~~. The ~~combination of~~ stepped case + Ultra Prima 8-position movement ~~is the apex 1527 configuration~~; the Antiquorum 2006 Mondani Bamboo bracelet 1527 (1931, hammer CHF 27,140) is the canonical reference example.		Extra Prima is more common than Ultra Prima on both the 1490 and the 1527. Fewer Ultra Prima 1527s are documented, in keeping with the smaller number of 1527 examples overall. The stepped case also appears with an Ultra Prima 8-position movement; the Antiquorum 2006 Mondani Bamboo bracelet 1527 (1931, hammer CHF 27,140) is the canonical reference example.

	The 1927 Wilsdorf-Aegler shaped-movement patent applies. The Aegler-Rolex relationship was a supplier arrangement until Rolex purchased Aegler in April 2004 (Tim Mosso, Quill & Pad). The cal. 300 winding-stem bridge fail-point applies to 1527 movements as it does to all Prince calibers — a 1527 that sets time then disengages immediately is a textbook broken stem bridge — a known, serviceable fault~~. Service-trained watchmakers will recognize the fault pattern~~.		The 1927 Wilsdorf-Aegler shaped-movement patent applies. The Aegler-Rolex relationship was a supplier arrangement until Rolex purchased Aegler in April 2004 (Tim Mosso, Quill & Pad). The cal. 300 winding-stem bridge fail-point applies to 1527 movements as it does to all Prince calibers — a 1527 that sets time then disengages immediately is a textbook broken stem bridge — a known, serviceable fault.

	The closest authentication mistake to be aware of is the Cal. 360 Prince Elegant case-mistake — the NAWCC thread "Cal 300 vs Cal 360 Prince Elegant" documents collectors confusing the cal. 360 HW (which carries tonneau plates) for a Prince movement when it actually appears in the Prince Elegant 2771 case rather than the standard Prince family. A 1527 with a tonneau-plate movement under the dial is not impossible but warrants careful verification against the reference's expected rectangular-plate T.S. 300 architecture.		The closest authentication mistake to be aware of is the Cal. 360 Prince Elegant case-mistake — the NAWCC thread "Cal 300 vs Cal 360 Prince Elegant" documents collectors confusing the cal. 360 HW (which carries tonneau plates) for a Prince movement when it actually appears in the Prince Elegant 2771 case rather than the standard Prince family. A 1527 with a tonneau-plate movement under the dial is not impossible but warrants careful verification against the reference's expected rectangular-plate T.S. 300 architecture.
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	==Authentication==		==Authentication==

	~~The 1527 has a tractable authentication workflow because~~ the case construction is the ~~canonical anchor~~.		Assessment starts with the case construction and its material, then the movement and hallmarks.

	# Solid stepped gold construction. A genuine 1527 case shows alternating gold colors integral to the case wall. Modern fakes rely on plating; period-correct construction does not. Wear-revealed metal showing through the bicolor pattern is the immediate authentication failure.		# Solid stepped gold construction. A genuine 1527 case shows alternating gold colors integral to the case wall. Modern fakes rely on plating; period-correct construction does not. Wear-revealed metal showing through the bicolor pattern is the immediate authentication failure.

	# T.S. 300 movement under the dial. A 1527 should carry an Aegler 7½′′′ T.S. 300 in Extra Prima or Ultra Prima grade. A Cal. 350 (standard 1490 caliber), a non-Aegler base movement (Schild, Peseux, ETA), or a tonneau-plate Cal. 360 HW (Prince Elegant 2771 caliber) under a 1527 dial is a transplant or a misidentified case. The watchmaker community on NAWCC documents the cal. 360 Prince Elegant misattribution as ~~the closest fake/error vector~~.		# T.S. 300 movement under the dial. A 1527 should carry an Aegler 7½′′′ T.S. 300 in Extra Prima or Ultra Prima grade. A Cal. 350 (standard 1490 caliber), a non-Aegler base movement (Schild, Peseux, ETA), or a tonneau-plate Cal. 360 HW (Prince Elegant 2771 caliber) under a 1527 dial is a transplant or a misidentified case. The watchmaker community on NAWCC documents the cal. 360 Prince Elegant misattribution as a source of misidentification.

	# Glasgow / Edinburgh hallmarks on 9K bicolor examples. The 9K configuration was a Glasgow British-import workflow; the cases carry assay-office year-letter codes that pin the case to a specific year. A 9K 1527 without British hallmarks is suspicious.		# Glasgow / Edinburgh hallmarks on 9K bicolor examples. The 9K configuration was a Glasgow British-import workflow; the cases carry assay-office year-letter codes that pin the case to a specific year. A 9K 1527 without British hallmarks is suspicious.

← Older revision		Revision as of 04:51, 7 September 2026
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	</div>		</div>

	The 1527 is the Railway Prince. The case steps inward from the lugs in machined bands of solid gold, alternating white with pink (the canonical pairing) or white with yellow on rarer examples, producing a profile that read in the late 1920s and 1930s as obviously locomotive-inspired Art Deco. Each step is a discrete piece of solid 18K gold ~~rather than an applied band over a base~~ case, which makes the construction structurally distinct from the smooth bicolor 971A "Tiger Stripe" and visually distinct from every other Prince reference. The duo-dial layout is the standard Prince architecture — hours and minutes upper, sub-seconds at six — and the movement is the Aegler 7½′′′ T.S. 300 in Extra Prima or Ultra Prima grade. Production runs from a documented 1931 Mondani example into the 1940s, with a steel + gold-filled Bonhams 2006 lot anchoring the late-production end. The reference is genuinely rare in the modern auction record — fewer than fifteen distinct lots in the public auction record across the past three decades, comparable to the 971 in stepped-bicolor form rather than to the more common 1490. The collector watchmaker watch-guy.com calls it "the only rectangular Prince worth having."		The 1527 is the Railway Prince. The case steps inward from the lugs in machined bands of solid gold, alternating white with pink (the canonical pairing) or white with yellow on rarer examples, producing a profile that read in the late 1920s and 1930s as obviously locomotive-inspired Art Deco. Each step is a discrete piece of solid 18K gold machined into the case itself, which makes the construction structurally distinct from the smooth bicolor 971A "Tiger Stripe" and visually distinct from every other Prince reference. The duo-dial layout is the standard Prince architecture — hours and minutes upper, sub-seconds at six — and the movement is the Aegler 7½′′′ T.S. 300 in Extra Prima or Ultra Prima grade. Production runs from a documented 1931 Mondani example into the 1940s, with a steel + gold-filled Bonhams 2006 lot anchoring the late-production end. The reference is genuinely rare in the modern auction record — fewer than fifteen distinct lots in the public auction record across the past three decades, comparable to the 971 in stepped-bicolor form rather than to the more common 1490. The collector watchmaker watch-guy.com calls it "the only rectangular Prince worth having."


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	The 1527 sits in the same straight-sided Classic Prince family as the 1862 — neither carries the flared Brancard profile of the 971 or 1490 — but the stepped case treatment is unique to the 1527 within the Prince catalog. The reference launches in 1930 (per the Antiquorum May 2006 Mondani lot 108/33 explicitly dated "Made in 1931," and earlier Antiquorum Vicenza 1992 lot 146 dating one example to 1930) and continues into the 1940s, with the Bonhams NY 2006 lot 15217/9 documented as a 1940s-dated steel + gold-filled example. The brief framing of 1935 launch found in some collector summaries is not supported by the primary auction-catalog evidence; revise to 1930.		The 1527 sits in the same straight-sided Classic Prince family as the 1862 — neither carries the flared Brancard profile of the 971 or 1490 — but the stepped case treatment is unique to the 1527 within the Prince catalog. The reference launches in 1930 (per the Antiquorum May 2006 Mondani lot 108/33 explicitly dated "Made in 1931," and earlier Antiquorum Vicenza 1992 lot 146 dating one example to 1930) and continues into the 1940s, with the Bonhams NY 2006 lot 15217/9 documented as a 1940s-dated steel + gold-filled example. The brief framing of 1935 launch found in some collector summaries is not supported by the primary auction-catalog evidence; revise to 1930.

	The 1527 is contemporary with the 971 / 971A, the 1490, and the 1862. Its position in that group is the visual extreme — the stepped sides give the case a profile that even a casual observer can identify at arm's length. The 971A "Tiger Stripe" is a flat-sided Brancard with bicolor gold ridges that read as smooth bands across a continuous case; the 1527 takes that bicolor concept and reorganizes it into a stepped construction where each metal band is a separately-machined piece of solid gold occupying its own physical step. The Watchprosite collector record describes a transitional 971-case variant — "facetted or stepped striped Prince where the two tone gold is separated by ridges rather than being smooth" — that bridges the 971A to the 1527 and reinforces the read that the 1527 is ~~the destination of~~ the bicolor experiment~~, not its starting point~~.		The 1527 is contemporary with the 971 / 971A, the 1490, and the 1862. Its position in that group is the visual extreme — the stepped sides give the case a profile that even a casual observer can identify at arm's length. The 971A "Tiger Stripe" is a flat-sided Brancard with bicolor gold ridges that read as smooth bands across a continuous case; the 1527 takes that bicolor concept and reorganizes it into a stepped construction where each metal band is a separately-machined piece of solid gold occupying its own physical step. The Watchprosite collector record describes a transitional 971-case variant — "facetted or stepped striped Prince where the two tone gold is separated by ridges rather than being smooth" — that bridges the 971A to the 1527 and reinforces the read that the 1527 is the bicolor experiment's endpoint.

	The 1527's commercial fate is harder to pin down than the 1490's. Friedberg's 2001 Timezone article gives the 1527 a single caption-level sentence; Rolex Magazine's 2017 history mentions the Railway nickname briefly without dating the production end; Hodinkee, Monochrome, Fratello, Worn & Wound, Le Monde Edmond, and the major editorial outlets carry no dedicated 1527 feature. The reference's record runs through auction catalogs almost exclusively — Antiquorum carries the deepest 1527 trail with at least four lots over 1992–2006, and Sotheby's, Christie's, Bonhams, and Artcurial fill out the rest. The thin editorial coverage is itself a load-bearing fact: the 1527 is rare enough that the magazines that cover the Prince family treat it as a footnote even within the Prince story.		The 1527's commercial fate is harder to pin down than the 1490's. Friedberg's 2001 Timezone article gives the 1527 a single caption-level sentence; Rolex Magazine's 2017 history mentions the Railway nickname briefly without dating the production end; Hodinkee, Monochrome, Fratello, Worn & Wound, Le Monde Edmond, and the major editorial outlets carry no dedicated 1527 feature. The reference's record runs through auction catalogs almost exclusively — Antiquorum carries the deepest 1527 trail with at least four lots over 1992–2006, and Sotheby's, Christie's, Bonhams, and Artcurial fill out the rest. The thin editorial coverage is itself a load-bearing fact: the 1527 is rare enough that the magazines that cover the Prince family treat it as a footnote even within the Prince story.
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	[[File:Ref 1527 white-pink-1992.webp\|thumb\|right\|240px\|alt=Rolex Prince Railway 1527 18ct white and pink gold 1930s\|18 ct white + pink gold stepped 1527 with pink gold + stainless steel beads-of-rice bracelet, Antiquorum Vicenza Oro 1992 lot 146 — earliest documented "Prince Railway" catalog naming]]		[[File:Ref 1527 white-pink-1992.webp\|thumb\|right\|240px\|alt=Rolex Prince Railway 1527 18ct white and pink gold 1930s\|18 ct white + pink gold stepped 1527 with pink gold + stainless steel beads-of-rice bracelet, Antiquorum Vicenza Oro 1992 lot 146 — earliest documented "Prince Railway" catalog naming]]
	"Railway" is collector convention ~~rather than Rolex catalog vocabulary~~. No period Rolex advertisement using the term has surfaced; the earliest catalog use traces to Antiquorum's 1992 Vicenza Oro auction (lot 146), which describes the 1527 as the "Prince Railway" and grounds the nickname in the visual analogy to locomotive forms — the stepped sides reading like the riveted side panels of a 1930s passenger carriage. French-language mirrors render the same nickname as "Chemin de Fer" (literally "iron road"), and Italian collector usage sometimes carries the term as well, but the primary collector convention in English-language auction catalogs is "Railway."		"Railway" is a collector convention. No period Rolex advertisement using the term has surfaced; the earliest catalog use traces to Antiquorum's 1992 Vicenza Oro auction (lot 146), which describes the 1527 as the "Prince Railway" and grounds the nickname in the visual analogy to locomotive forms — the stepped sides reading like the riveted side panels of a 1930s passenger carriage. French-language mirrors render the same nickname as "Chemin de Fer" (literally "iron road"), and Italian collector usage sometimes carries the term as well, but the primary collector convention in English-language auction catalogs is "Railway."

	The Robb Report has separately identified a "Gold Jump Hour Railway Prince" as ref. 1571 — a different reference than 1527. The attribution is unverified by other sources and may be a typographical confusion with the 1491HS jumping-hour Brancard. Readers searching for "Railway Prince jumping hour" may land on conflicting reference numbers depending on the source.		The Robb Report has separately identified a "Gold Jump Hour Railway Prince" as ref. 1571 — a different reference than 1527. The attribution is unverified by other sources and may be a typographical confusion with the 1491HS jumping-hour Brancard. Readers searching for "Railway Prince jumping hour" may land on conflicting reference numbers depending on the source.

	==The case — solid stepped gold~~, not applied bands~~==		==The case — solid stepped gold==

	The 1527 case is the structural anchor of the reference. Each step is a discrete piece of solid gold ~~rather than an applied band over a base~~ case: the white-gold strip is solid 18K white gold (or 9 ct on Glasgow-imported examples), the pink-gold strip is solid 18K rose, and the steps are joined at the case body with the bicolor pattern integral to the construction. A 1527 case cut in cross-section ~~would show~~ alternating gold colors ~~all~~ the ~~way through~~ the case wall~~, not a base metal with cosmetic plating~~. This is the canonical authentication tell: a stepped Prince whose bicolor sides reveal a base metal under the gold layers in any wear-revealed spot is not a 1527 in any meaningful sense. Modern fakes rely on plating; period-correct construction does not.		The 1527 case is the structural anchor of the reference. Each step is a discrete piece of solid gold machined into the case: the white-gold strip is solid 18K white gold (or 9 ct on Glasgow-imported examples), the pink-gold strip is solid 18K rose, and the steps are joined at the case body with the bicolor pattern integral to the construction. A 1527 case cut in cross-section shows alternating gold colors running solid through the full thickness of the case wall. This is the canonical authentication tell: a stepped Prince whose bicolor sides reveal a base metal under the gold layers in any wear-revealed spot is not a 1527 in any meaningful sense. Modern fakes rely on plating; period-correct construction does not.

	The case body measures approximately 23 mm × 42 mm with horns. Documented examples cluster in two slightly different proportions: a shorter form (1527 case 16038, EveryWatch examples) and a longer form (Antiquorum 108/33 Mondani 1931). ~~The dimensional split is consistent with measurement convention rather than two case sizes —~~ Bonhams typically measures bezel only, Antiquorum measures to the horn ends. Glasgow / Edinburgh import hallmarks appear on the 9-carat examples and date the case import precisely; the Bonhams 2026 sale 31977 lot 25 (18K white + pink) and lot 29 (two-color 18K) carry British hallmarks consistent with imports through the 1930s.		The case body measures approximately 23 mm × 42 mm with horns. Documented examples cluster in two slightly different proportions: a shorter form (1527 case 16038, EveryWatch examples) and a longer form (Antiquorum 108/33 Mondani 1931). Bonhams typically measures bezel only and Antiquorum measures to the horn ends, which accounts for the dimensional split without implying two distinct case sizes. Glasgow / Edinburgh import hallmarks appear on the 9-carat examples and date the case import precisely; the Bonhams 2026 sale 31977 lot 25 (18K white + pink) and lot 29 (two-color 18K) carry British hallmarks consistent with imports through the 1930s.

	==Materials documented==		==Materials documented==
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	* 18K two-tone (unspecified pairing) — Christie's NY 2015 lot 28 (hammer USD 8,750), Bonhams London 2026 lot 29.		* 18K two-tone (unspecified pairing) — Christie's NY 2015 lot 28 (hammer USD 8,750), Bonhams London 2026 lot 29.
	* 9K bicolor — Sotheby's NY 2019 sale N10082 lot 169. Glasgow imports use 9K rather than 18K and carry the British assay-office year-letter hallmark on the inside of the caseback.		* 9K bicolor — Sotheby's NY 2019 sale N10082 lot 169. Glasgow imports use 9K rather than 18K and carry the British assay-office year-letter hallmark on the inside of the caseback.
	* Steel + gold-filled — Bonhams NY 2006 sale 15217 lot 9, the late-production anchor at 1940s, hammer USD 1,912. The most affordable 1527 configuration; gold-filled ~~rather than solid gold~~ gives the stepped case a similar visual ~~without~~ the precious-metal cost.		* Steel + gold-filled — Bonhams NY 2006 sale 15217 lot 9, the late-production anchor at 1940s, hammer USD 1,912. The most affordable 1527 configuration; the gold-filled construction gives the stepped case a similar visual at a fraction of the precious-metal cost.
	* Stainless steel — Sotheby's NY 2008 Time Museum auction (sale N08474), single documented example. The rarest material on a 1527.		* Stainless steel — Sotheby's NY 2008 Time Museum auction (sale N08474), single documented example. The rarest material on a 1527.

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	The grade ratio reverses the 1490 pattern. On 1490 examples, Extra Prima dominates and Ultra Prima is the upper-tier outlier. On 1527 examples, the same Extra Prima dominance holds but the absolute count of Ultra Prima 1527s is smaller because the 1527 itself is rarer than the 1490 by an order of magnitude. The combination of stepped case + Ultra Prima 8-position movement is the apex 1527 configuration; the Antiquorum 2006 Mondani Bamboo bracelet 1527 (1931, hammer CHF 27,140) is the canonical reference example.		The grade ratio reverses the 1490 pattern. On 1490 examples, Extra Prima dominates and Ultra Prima is the upper-tier outlier. On 1527 examples, the same Extra Prima dominance holds but the absolute count of Ultra Prima 1527s is smaller because the 1527 itself is rarer than the 1490 by an order of magnitude. The combination of stepped case + Ultra Prima 8-position movement is the apex 1527 configuration; the Antiquorum 2006 Mondani Bamboo bracelet 1527 (1931, hammer CHF 27,140) is the canonical reference example.

	The 1927 Wilsdorf-Aegler shaped-movement patent applies. The Aegler-Rolex relationship was a supplier arrangement until Rolex purchased Aegler in April 2004 (Tim Mosso, Quill & Pad). The cal. 300 winding-stem bridge fail-point applies to 1527 movements as it does to all Prince calibers — a 1527 that sets time then disengages immediately is ~~symptomatic of~~ a broken stem bridge, ~~not a hidden~~ fault. Service-trained watchmakers will recognize the fault pattern.		The 1927 Wilsdorf-Aegler shaped-movement patent applies. The Aegler-Rolex relationship was a supplier arrangement until Rolex purchased Aegler in April 2004 (Tim Mosso, Quill & Pad). The cal. 300 winding-stem bridge fail-point applies to 1527 movements as it does to all Prince calibers — a 1527 that sets time then disengages immediately is a textbook broken stem bridge — a known, serviceable fault. Service-trained watchmakers will recognize the fault pattern.

	The closest authentication mistake to be aware of is the Cal. 360 Prince Elegant case-mistake — the NAWCC thread "Cal 300 vs Cal 360 Prince Elegant" documents collectors confusing the cal. 360 HW (which carries tonneau plates) for a Prince movement when it actually appears in the Prince Elegant 2771 case rather than the standard Prince family. A 1527 with a tonneau-plate movement under the dial is not impossible but warrants careful verification against the reference's expected rectangular-plate T.S. 300 architecture.		The closest authentication mistake to be aware of is the Cal. 360 Prince Elegant case-mistake — the NAWCC thread "Cal 300 vs Cal 360 Prince Elegant" documents collectors confusing the cal. 360 HW (which carries tonneau plates) for a Prince movement when it actually appears in the Prince Elegant 2771 case rather than the standard Prince family. A 1527 with a tonneau-plate movement under the dial is not impossible but warrants careful verification against the reference's expected rectangular-plate T.S. 300 architecture.
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	The 1527 has a tractable authentication workflow because the case construction is the canonical anchor.		The 1527 has a tractable authentication workflow because the case construction is the canonical anchor.

	# Solid stepped gold~~, not applied bands~~. A genuine 1527 case shows alternating gold colors integral to the case wall. Modern fakes rely on plating; period-correct construction does not. Wear-revealed metal showing through the bicolor pattern is the immediate authentication failure.		# Solid stepped gold construction. A genuine 1527 case shows alternating gold colors integral to the case wall. Modern fakes rely on plating; period-correct construction does not. Wear-revealed metal showing through the bicolor pattern is the immediate authentication failure.

	# T.S. 300 movement under the dial. A 1527 should carry an Aegler 7½′′′ T.S. 300 in Extra Prima or Ultra Prima grade. A Cal. 350 (standard 1490 caliber), a non-Aegler base movement (Schild, Peseux, ETA), or a tonneau-plate Cal. 360 HW (Prince Elegant 2771 caliber) under a 1527 dial is a transplant or a misidentified case. The watchmaker community on NAWCC documents the cal. 360 Prince Elegant misattribution as the closest fake/error vector.		# T.S. 300 movement under the dial. A 1527 should carry an Aegler 7½′′′ T.S. 300 in Extra Prima or Ultra Prima grade. A Cal. 350 (standard 1490 caliber), a non-Aegler base movement (Schild, Peseux, ETA), or a tonneau-plate Cal. 360 HW (Prince Elegant 2771 caliber) under a 1527 dial is a transplant or a misidentified case. The watchmaker community on NAWCC documents the cal. 360 Prince Elegant misattribution as the closest fake/error vector.