Model: Silverstone BlueReference: 110.313Date: Circa 1974Movement: 17-jewel Cal.12 automaticDial: Blue, raised outer luminous baton hour markers, white outer 1/5th second divisions, subsidiary dials at 3 and 9 for 30 minute and 12 hour recording, date aperture at 6, white pointed baton hands with luminous inserts, white centre chronograph handCase: Brushed and polished cushion form, screw down back, concave bezel, signed crown at 9 and twin pushers at 2 and 4, No.307612Strap/Bracelet: Fitted blue racing calf skin strap Buckle/Clasp: Signed stainless steel buckleSigned: Case, dial & movementSize: 42mm Accompaniments: Heuer box