Reference:16753: Difference between revisions

Line 84:

== Movement notes ==

Caliber 3075 is the same automatic that powers the all-steel 16750: 27 jewels, 28,800 vph, 48–50-hour reserve, free-sprung Microstella balance with Breguet overcoil, hacking seconds, quickset date through the crown. Hand-stack order changed from the 1575GMT to hour / GMT / minute / second. No 16753-specific tuning surfaces in the ~~corpus~~ — movement parts are interchangeable with the 16750 except for casing parts.

Caliber 3075 is the same automatic that powers the all-steel 16750: 27 jewels, 28,800 vph, 48–50-hour reserve, free-sprung Microstella balance with Breguet overcoil, hacking seconds, quickset date through the crown. Hand-stack order changed from the 1575GMT to hour / GMT / minute / second. No 16753-specific tuning surfaces in the auction record — movement parts are interchangeable with the 16750 except for casing parts.

Caliber 3075 retains the linked-hand caller-GMT mechanic. The 24-hour hand cannot be set independent of the local hour hand on the 16753 — the second time zone is read off the bezel. Independent local hour arrives only with caliber 3085 in the GMT-Master II 16760 (1983) and the two-tone 16713 (1989). Service-era movement swaps from caliber 3075 to caliber 3175 are documented; a 3175 in a 16753 case is a service replacement.

Line 108:

=== Matte transitional (disputed) ===

A specialist source describes a "pristine clean matte dial rather than glossy" on a c.1979 6.1M-serial example. If accurate, the matte branch sits at the very front of the run, immediately following the 16750's matte dials. Capture as plausible but disputed pending a second independent corroboration; no major-house lot in ~~the surveyed corpus~~ catalogs a matte 16753.

A specialist source describes a "pristine clean matte dial rather than glossy" on a c.1979 6.1M-serial example. If accurate, the matte branch sits at the very front of the run, immediately following the 16750's matte dials. Capture as plausible but disputed pending a second independent corroboration; no major-house lot in documented examples catalogs a matte 16753.

@@ Line 84: / Line 84: @@
 == Movement notes ==
-Caliber 3075 is the same automatic that powers the all-steel 16750: 27 jewels, 28,800 vph, 48–50-hour reserve, free-sprung Microstella balance with Breguet overcoil, hacking seconds, quickset date through the crown. Hand-stack order changed from the 1575GMT to hour / GMT / minute / second. No 16753-specific tuning surfaces in the corpus — movement parts are interchangeable with the 16750 except for casing parts.
+Caliber 3075 is the same automatic that powers the all-steel 16750: 27 jewels, 28,800 vph, 48–50-hour reserve, free-sprung Microstella balance with Breguet overcoil, hacking seconds, quickset date through the crown. Hand-stack order changed from the 1575GMT to hour / GMT / minute / second. No 16753-specific tuning surfaces in the auction record — movement parts are interchangeable with the 16750 except for casing parts.
 Caliber 3075 retains the linked-hand caller-GMT mechanic. The 24-hour hand cannot be set independent of the local hour hand on the 16753 — the second time zone is read off the bezel. Independent local hour arrives only with caliber 3085 in the GMT-Master II 16760 (1983) and the two-tone 16713 (1989). Service-era movement swaps from caliber 3075 to caliber 3175 are documented; a 3175 in a 16753 case is a service replacement.
@@ Line 108: / Line 108: @@
 === Matte transitional (disputed) ===
-A specialist source describes a "pristine clean matte dial rather than glossy" on a c.1979 6.1M-serial example. If accurate, the matte branch sits at the very front of the run, immediately following the 16750's matte dials. Capture as plausible but disputed pending a second independent corroboration; no major-house lot in the surveyed corpus catalogs a matte 16753.
+A specialist source describes a "pristine clean matte dial rather than glossy" on a c.1979 6.1M-serial example. If accurate, the matte branch sits at the very front of the run, immediately following the 16750's matte dials. Capture as plausible but disputed pending a second independent corroboration; no major-house lot in documented examples catalogs a matte 16753.
 <span id="case-bezel-crystal-and-crown"></span>