Model: CarreraReference: 1553 NDate: Circa 1972Movement: 17-jewel Cal.15 automatic Dial: Blue with silvered sector, applied polished luminous tipped hour markers, white outer 1/5th second divisions, raised outer Tachymeter scale, silvered subsidiary dials at 3 and 10 for constant seconds and 30 minute recording, white pointed baton hands with luminous inserts, orange chronograph handCase: Brushed and polished tonneau form, screw down back, signed crown at 9, twin chronograph buttons at 2 and 4, No.285270Strap/Bracelet: Stainless steel Gay Freres linkBuckle/Clasp: Signed folding claspSigned: Case, dial & movementSize: 38mm