Model: GMT MasterReference: 16750Date: Circa 1983Movement: 27-jewel Cal.3075 automatic, adjusted to 5 positions and temperatures, No.078****Dial: Matte black, signed Tiffany & Co, luminous dot hour markers, baton quarters, outer minute divisions, magnified date aperture at 3, polished Mercedes hands with luminous inserts, centre seconds, red luminous tipped dual time zone handCase: Brushed and polished tonneau form, screw down Oyster back and shouldered crown, bi-directional calibrated red and blue 'Pepsi' bezel, No.747****Strap/Bracelet: Fitted stainless steel 78360 Oyster link Buckle/Clasp: Signed folding clasp, stamped HSigned: Case, dial & movementSize: 39mm