Reference: 510. 543 lt A.M.I.Date: Circa 1975Movement: 17-jewel Lemania Cal.5100 automaticDial: Black, red 3H, luminous baton and raised Arabic hour markers, white outer 1/5th second divisions, subsidiary dials at 6, 9 and 12 for constant seconds, 12 hour recording and 24 hour indication, day and date aperture at 3, luminous pointed baton hands, centre chronograph hand, orange tipped hand for second time zoneCase: Brushed and polished tonneau form, screw down back, crown flanked by twin pushers, engraved to the back '6645.12.194.8642', No.01677Strap/Bracelet: Stainless steel link Buckle/Clasp: Signed folding claspSigned: Dial & movement, case signed Tag HeuerSize: 40mm