3053. Omega. A rare automatic calendar chronograph bracelet watch with dual time zone Model: Seamaster 120 'Big Blue' Reference: 176.004 Date: Circa 1973 Movement: 22-jewel Cal.1040 automatic, No.36258689 Dial: Discoloured blue, luminous baton hour markers, white outer minute divisions, date aperture at 3, subsidiary dials at 6 and 9 for running seconds, red triangle dual time zone indication and 12 hour recording, white baton hands with luminous inserts, centre orange arrow-tipped minute chronograph and second chronograph hands Case: Massive tonneau form, screw down back and crown flanked by twin pushers, blue calibrated bezel Strap/Bracelet: Integrated stainless steel shark link Buckle/Clasp: Signed steel clasp Signed: Case, dial & movement Size: 44mm x 52mm