Reference:1858: Difference between revisions

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| movement

| Cal. 520 (Hunter ~~8¾'''~~)

| Cal. 520 (Hunter 8¾′′′)

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| dial

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== The Cal. 520 ==

The Cal. 520 is a Hunter ~~8¾'''~~ movement from Aegler, derived from the 500-series manual-wind base (Cal. 500/510/530 share the same main plate family). Seventeen jewels standard; some premium Chronometer-graded examples carry nineteen. The escapement is a Swiss lever; the balance is screwed and adjusted in six positions; the hairspring is a blued Breguet overcoil. The rotor winds in one direction only; true bidirectional winding does not arrive in a Rolex movement until Cal. 1030 in 1950.

The Cal. 520 is a Hunter 8¾′′′ movement from Aegler, derived from the 500-series manual-wind base (Cal. 500/510/530 share the same main plate family). Seventeen jewels standard; some premium Chronometer-graded examples carry nineteen. The escapement is a Swiss lever; the balance is screwed and adjusted in six positions; the hairspring is a blued Breguet overcoil. The rotor winds in one direction only; true bidirectional winding does not arrive in a Rolex movement until Cal. 1030 in 1950.

Dealer literature commonly calls the movement "Hunter 8¾ ligne" based on the dial-side dimension. Rolex parts books group it with 9¾-NA, using the parts-catalog sizing code for the 9¾L dial-side group. The movement blank is physically 9¾L; the 8¾ figure is the dial-side measurement used in sales contexts. Both are correct for different measurements of the same physical caliber.

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Bucherer co-signing is the most common retailer configuration on the reference. Both Antiquorum examples from 2006 and 2013 (cases 14224 and 48191) carry C. Bucherer retailer signatures, two of the five confirmed public auction lots. The Vintage & Prestige 9K yellow gold dealer listing was also Bucherer co-signed.

A black gilt dial (glossy black with gold-toned text) appears on the Antiquorum Hong Kong 2021 example (case 48449). The Antiquorum catalog lists the caliber as ~~9¾'''~~ rather than the standard 8¾ Cal. 520, which may be a cataloging error or indicate a later-variant movement.

A black gilt dial (glossy black with gold-toned text) appears on the Antiquorum Hong Kong 2021 example (case 48449). The Antiquorum catalog lists the caliber as 9¾′′′ rather than the standard 8¾ Cal. 520, which may be a cataloging error or indicate a later-variant movement.

No box-and-papers 1858 has ever appeared at public auction. The Phillips lot retained its original leather strap and SS Rolex buckle, but no period box surfaced. The Vintage & Prestige 9K gold listing had grandfather-to-grandson single-family provenance but no papers.

@@ Line 51: / Line 51: @@
 |-
 | movement
-| Cal. 520 (Hunter 8¾''')
+| Cal. 520 (Hunter 8¾′′′)
 |-
 | dial
@@ Line 108: / Line 108: @@
 == The Cal. 520 ==
-The Cal. 520 is a Hunter 8¾''' movement from Aegler, derived from the 500-series manual-wind base (Cal. 500/510/530 share the same main plate family). Seventeen jewels standard; some premium Chronometer-graded examples carry nineteen. The escapement is a Swiss lever; the balance is screwed and adjusted in six positions; the hairspring is a blued Breguet overcoil. The rotor winds in one direction only; true bidirectional winding does not arrive in a Rolex movement until Cal. 1030 in 1950.
+The Cal. 520 is a Hunter 8¾′′′ movement from Aegler, derived from the 500-series manual-wind base (Cal. 500/510/530 share the same main plate family). Seventeen jewels standard; some premium Chronometer-graded examples carry nineteen. The escapement is a Swiss lever; the balance is screwed and adjusted in six positions; the hairspring is a blued Breguet overcoil. The rotor winds in one direction only; true bidirectional winding does not arrive in a Rolex movement until Cal. 1030 in 1950.
 Dealer literature commonly calls the movement "Hunter 8¾ ligne" based on the dial-side dimension. Rolex parts books group it with 9¾-NA, using the parts-catalog sizing code for the 9¾L dial-side group. The movement blank is physically 9¾L; the 8¾ figure is the dial-side measurement used in sales contexts. Both are correct for different measurements of the same physical caliber.
@@ Line 131: / Line 131: @@
 Bucherer co-signing is the most common retailer configuration on the reference. Both Antiquorum examples from 2006 and 2013 (cases 14224 and 48191) carry C. Bucherer retailer signatures, two of the five confirmed public auction lots. The Vintage &amp; Prestige 9K yellow gold dealer listing was also Bucherer co-signed.
-A black gilt dial (glossy black with gold-toned text) appears on the Antiquorum Hong Kong 2021 example (case 48449). The Antiquorum catalog lists the caliber as 9¾''' rather than the standard 8¾ Cal. 520, which may be a cataloging error or indicate a later-variant movement.
+A black gilt dial (glossy black with gold-toned text) appears on the Antiquorum Hong Kong 2021 example (case 48449). The Antiquorum catalog lists the caliber as 9¾′′′ rather than the standard 8¾ Cal. 520, which may be a cataloging error or indicate a later-variant movement.
 No box-and-papers 1858 has ever appeared at public auction. The Phillips lot retained its original leather strap and SS Rolex buckle, but no period box surfaced. The Vintage &amp; Prestige 9K gold listing had grandfather-to-grandson single-family provenance but no papers.