Model: CarreraReference: 2456S Date: Circa 1969Movement: 17-jewel Cal.72 Valjoux manual wind, signed Heuer Leonidas on the bridgeDial: Matte eggshell, applied faceted baton hour markers, raised outer black 1/5th second divisions to silvered surround, subsidiary dials at 3, 6 and 9 for constant seconds, 30 minute and 12 hour recording, polished gilt baton hands with luminous inserts, centre chronograph handCase: Brushed and polished round, screw down back, signed crown flanked by twin chronograph pushersStrap/Bracelet: Black racing leatherBuckle/Clasp: Signed gold plated buckleSigned: Case, dial & movementSize: 38mm