297. Rolex. Montre bracelet en or jaune 18K (750) avec date, 2nd fuseau horaire et cadran 'nipple' mouvement automatique Rolex. An 18K gold automatic calendar bracelet watch with dual-time zone and 'nipple' dial Model: GMT-Master Reference: 1675 Date: Circa 1978 Movement: 26-jewel Cal.1570 automatic, adjusted to 5 positions and temperature, No.DD499161 Dial: Black, applied luminous filled 'nipple' gilt dot hour markers, baton quarters, gilt outer minute divisions, magnified date aperture at 3, gilt Mercedes hands with luminous inserts, arrow tipped dual time zone hand, centre seconds Case: Brushed and polished tonneau form, screw down back, shouldered screw down crown, bi-directional bezel with black calibrated insert, Geneva stamp in the inside case back, No.5561059 Strap/Bracelet: Brushed and polished Oyster rivet link, end links stamped 57 Buckle/Clasp: Signed 18K gold folding clasp, stamped 2/69 Signed: Case, dial & movement Size: 40mm Weight: 111,62g 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 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. Our particular 18K gold model features luminous filled 'nipple' gilt dot hour markers. To upgrade the appearance of the dial; several gold versions of the Submariner and GMT Master were fitted with gold chaton markers in which the luminescent was placed, instead of the regular directly applied luminescent dots and batons as found on the steel versions. The use of applied chatons to the dial has created the affectionate nickname 'nipple dial' amongst Rolex enthusiasts.