Model: CalculatorReference: 110.633Date: Circa 1977Movement: 17-jewel Cal.12 automaticDial: Black, luminous baton hour markers, white outer 1/5th second divisions, subsidiary dials at 3 and 9 for 30 minute with white sectors and 12 hour recording, date aperture at 6, white pointed baton hands with luminous inserts, white chronograph handCase: Brushed and polished cushion form, screw down back, large rotating bezel marked for calculationsStrap/Bracelet: Stainless steel graduated linkBuckle/Clasp: Signed folding claspSigned: Case, dial & movementSize: 45mm