Model: CarreraReference: 7753NTDate: Circa 1969Movement: 17-jewel Valjoux 7730 manual wind, signed Heuer Leonidas on the bridgeDial: Matte black, faceted baton hour markers with white accents, outer sunken tachymetre scale, raised outer 1/5th second divisions to silvered surround, silvered engine turned subsidiary dials at 3 and 9 for constant seconds and 30 minute recording, pointed baton hands with luminous inserts and black accents, centre chronograph handCase: Polished round, screw down back, signed crown flanked by twin pushers, No.105638Strap/Bracelet: Black calf skinBuckle/Clasp: Stainless steel buckleSigned: Case, dial & movementSize: 36mm