Zodiac Aerospace GMT
From Chronopedia
Zodiac Aeronaut and Aerospace GMT
Standard 3-hander watch with additional 24hr hand which rotates once every 24 hours around dial. Combined with rotating uni-directional 24hr bezel it offered a GMT-setting option. It was first seen around 1962. The calibre 75 had a 24-hour function and was used in the GMT. Some GMT models had a 24 hour movement marked 70-72. Later GMT watches used the calibre 75B with a quickset date function which involved pushing the crown, a counter-intuitive move.
Note all GMT cases have chamfered bezels which distinguish them from otherwise identical Seawolf cases
There are many versions of the GMT. Ref: 925
Version I - The Aeronaut Style 1762
- Ref 752.925 and 752.925LO (solid gold bezel version)
- Cal: Zodiac 75
- 2 dial colours - black and white
- plated brass bezel, single colour with green triangle to top
- thin hands with red tipped 24hr hand
- trapezoid date window
Version 2a -First Aerospace GMT 1762
- Ref 752.925
- Cal: Zodiac 75
- 2 dial colours - black and white
- 3 dial versions i)rectangular ii) double markers iii) thick markers
- plated or plated and split-painted bezel, with green triangle to top
- thin hands with red tipped 24hr hand for versions i) and ii) above.
- thick hands with dial version iii.
Version 2b -Gold Bezel Aerospace GMT 1780 and 1779
- Ref 752.925 LO
- Cal: Zodiac 75
- 2 dial colours - black and white
- solid gold bezel
Version 3 - Bezel Colour Variations 1870
- Ref 752.934, 752.834 and 752.984
- Cal: Zodiac 75 or 75B
- 2 dial colours - black and white with thick square markers
- thick square hands with pencil second hand or squared-lume end
- Multiple bezel colour variations including Pepsi and Coke-pink style, maroon, black and green, black and blue. black and grey etc. Unidirectional friction or spring-loaded
- Bezels are plastic insert, metal grooved edge bezel - NOT bakelite as often described.
- there is a rare Arabic dial and bezel version
WorldTime Version 752-934B
A rare World timer bezel and unique dial on GMT base. See here for more about this model.
Version 4 - The Quartz Models
Released in the 1990s.
