Rolex. A stainless steel and gold automatic calendar bracelet watch with dual time zone GMT-Master 'Root Beer', Ref 1675, Circa 1973Rolex. A stainless steel and gold automatic calendar bracelet watch with dual time zoneModel: GMT-Master 'Root Beer'Reference: 1675Date: Circa 1973Movement: 26-jewel Cal.1570 automatic, adjusted to 5 positions & temperature, No.D345507Dial: Chocolate brown, 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, centre seconds, arrow tipped dual time zone handCase: Brushed and polished tonneau form, screw down back, inside back date coded II.72, shouldered screw down crown, bi-directional rotating bezel with 'root beer' insert, No.3244473Strap/Bracelet: Steel and gold Oyster linkBuckle/Clasp: Signed folding claspSigned: Case, dial & movementSize: 39mmTo upgrade the appearance of the dial; the gold and steel and gold versions of the 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 version. The use of applied chatons to the dial has created the affectionate reference 'nipple dial' amongst Rolex enthusiasts.