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Reference:16750: Difference between revisions

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Deep correctness and anti-slop audit: Reference 16750
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{{DISPLAYTITLE:Rolex 16750 GMT-Master}}
{{DISPLAYTITLE:Rolex 16750 GMT-Master}}
{{#seo:
{{#seo:
|title=Rolex GMT-Master 16750 (1979–1988), Production & Dial Guide | Rolexopedia
|title=Rolex GMT-Master 16750, caliber 3075 and matte-to-gloss dial transition
|description=The 16750 is the first five-digit GMT-Master. Caliber 3075 brought a quick-set date and 28,800 vph while the linked-hand GMT remained. Produced around 1980–1988 with an acrylic crystal and aluminium bezel.
|description=The Rolex 16750 is the five-digit caller GMT-Master with caliber 3075, quick-set date, acrylic crystal, and matte or glossy dial configurations.
|keywords=Rolex, 16750, GMT-Master, caliber 3075, caller GMT, spider dial
|keywords=Rolex, 16750, GMT-Master, caliber 3075, caller GMT, spider dial
|image=Ref 16750 hero.webp
|image=Ref 16750 hero.webp
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</div>
</div>


The 16750 is the first five-digit GMT-Master and the last steel GMT-Master before the 16700. Caliber 3075 raised the beat rate to 28,800 vph and added a quick-set date, but the linked-hand caller-GMT remained: the 24-hour hand follows the local hour hand and the bezel sets the second zone. The steel reference kept the acrylic crystal while the gold 16758 moved to sapphire.
The 16750 is the first five-digit GMT-Master and the predecessor to the 16700. Caliber 3075 raised the beat rate to 28,800 vph and added a quick-set date while retaining the linked-hand caller-GMT: the 24-hour hand follows the local hour hand and the bezel sets the second zone. The steel reference kept an acrylic crystal; the gold 16758 used sapphire.


<span id="core-facts"></span>
<span id="core-facts"></span>
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Caliber 3075 is the main mechanical change over the 1575GMT. Reference guides and auction descriptions give 27 jewels, 28,800 vph, hacking seconds, and a quick-set date. Published movement tables commonly quote a reserve around 48 hours, while some registries round it nearer 50; the page does not treat either figure as a watch-specific test. The listed 28.5mm diameter and 6.2mm thickness are movement specifications, not case measurements.
Caliber 3075 is the main mechanical change over the 1575GMT. Reference guides and auction descriptions give 27 jewels, 28,800 vph, hacking seconds, and a quick-set date. Published movement tables commonly quote a reserve around 48 hours, while some registries round it nearer 50; the page does not treat either figure as a watch-specific test. The listed 28.5mm diameter and 6.2mm thickness are movement specifications, not case measurements.


The hand-setting stack also changed from the 1575GMT: the 24-hour hand sits above the hour hand, followed by the minute and seconds hands. The 3075 retains the linked-hand caller-GMT mechanic, so the 24-hour hand cannot be set independently on a 16750. The independent local-hour hand arrived with caliber 3085 in the 16760 and continued with caliber 3185 in the 16710.
Specialist movement diagrams describe a revised hand stack compared with the 1575GMT; the reference still uses the linked-hand caller-GMT arrangement. The 3075 retains the linked-hand caller-GMT mechanic, so the 24-hour hand cannot be set independently on a 16750. The independent local-hour hand arrived with caliber 3085 in the 16760 and continued with caliber 3185 in the 16710.


The 3075 gives way to caliber 3175 in the 16700 from 1988 to 1999. A 3175 in a 16750 case is a service or replacement movement unless the watch has documentation explaining the change; movement and case numbers need to be checked together.
The 3075 gives way to caliber 3175 in the 16700 from 1988 to 1999. A 3175 in a 16750 case is a service or replacement movement unless the watch has documentation explaining the change; movement and case numbers need to be checked together.
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=== Glossy white-gold-surround (~1986 onward) ===
=== Glossy white-gold-surround (~1986 onward) ===


Glossy black lacquer carries applied indices in white-gold surrounds, a layout also used on the 16760 and 16710. The period examples in the cited sources use tritium, but service dials and later replacements can change the lume material.
Glossy black lacquer carries applied indices in white-gold surrounds, a layout also used on the 16760 and 16710. The cited period examples use tritium, but service dials and later replacements can change the lume material.


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Service-replacement dials occur, including later dials marked only "Swiss" in place of the original "T SWISS T" wording. Service-era movement swaps from caliber 3075 to caliber 3175 also occur; the case, movement, dial, and service records should be read together.
Service-replacement dials occur, including later dials marked only "Swiss" in place of the original "T SWISS T" wording. Service-era movement swaps from caliber 3075 to caliber 3175 also occur; the case, movement, dial, and service records should be read together.


Caseback and mid-case markings help establish what is present, but neither proves that every component is original. A wide gap between the case serial and movement number is a lead to investigate. The Bonhams Hong Kong 2019 lot with case R672618 and movement number 1,828,172 is an example of an auction-catalogued service-replacement movement, not a universal dating rule.
Caseback and mid-case markings help establish what is present, but neither proves that every component is original. A wide gap between the case serial and movement number is a lead to investigate, not proof of a replacement by itself. The Bonhams Hong Kong 2019 lot with case R672618 and movement number 1,828,172 is an example of an auction-catalogued service-replacement movement, not a universal dating rule.


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The auction record shows a wide spread by condition, dial, provenance, and whether a lot includes its original accessories. The table is a record of individual lots, not a price guide for every 16750. Khanjar examples should be compared only with other documented government-logo dials, since a single estimate or result does not establish a general market tier.
The auction record varies with condition, dial, provenance, and original accessories. The table records individual lots rather than a price guide for every 16750. Khanjar examples should be compared with other documented government-logo dials; a single estimate or result does not establish a general market tier.


== Related references ==
== Related references ==
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See also the [[Reference:gmt-master|GMT-Master family index]], [[Reference:Movements|movement reference]], [[Reference:Bracelets|bracelet & clasp guide]], and [[Reference:Serial-numbers|serial numbers by year]].
See also the [[Reference:gmt-master|GMT-Master family index]], [[Reference:Movements|movement reference]], [[Reference:Bracelets|bracelet & clasp guide]], and [[Reference:Serial-numbers|serial numbers by year]].
<gallery mode="packed" heights="180">
File:Ref 16750 hero.webp|16750 overview|Acrylic-crystal GMT-Master 16750
File:Ref 16750 matte-pepsi.webp|Matte dial|Early matte Pepsi dial
File:Ref 16750 spider-dial.webp|Spider dial|Glossy spider dial example
File:Ref 16750 movement.webp|Caliber 3075|Movement view
File:Ref 16750 government-oman-police.webp|Omani Police branch|Royal Oman Police emblem dial
File:Ref 16750 black-service.webp|Service example|Black-bezel service example
</gallery>


== Sources ==
== Sources ==
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