Rolex. A stainless steel automatic calendar bracelet watch with dual time zone
Model: GMT Master 'Pepsi'
Reference: 1675
Date: Circa 1975
Movement: 26-jewel Cal.1570 automatic
Dial: Black, luminous dot hour markers, baton quarters, outer minute divisions, magnified date aperture at 3, polished Mercedes hands with luminous inserts, centre seconds, further red arrow tipped dual time zone hand
Case: Brushed and polished tonneau form, screw down back, shouldered crown, bi-directional blue and red 'pepsi' bezel insert, No.4013890
Strap/Bracelet: Fitted brushed 78360 Oyster link
Buckle/Clasp: Signed folding clasp, stamped RS6
Signed: Case, dial & movement
Size: 39mm
Accompaniments: Rolex service pouch, International Service Guarantee card dated February 2020, spare links, brochure
Footnotes:
The Rolex GMT was launched in 1954 after the Transatlantic Airways company asked Rolex to produce a watch useful for their pilots. It quickly gained favour among the Pan-Am executives and the business jet-set community as a whole.

Offered continuously since its introduction with relatively little modification it is perhaps, along with the Submariner, the most classic Rolex 'tool' watch made. The reference 1675 began production over 80 years ago in 1960. This was the first GMT Master reference to feature protective crown guards as well as the smaller triangular tip on the second hour hand.