Model: SilverstoneReference: 510.403Date: Circa 1983Movement: 17-jewel Cal.5012 Lemania manual wind, No.04008691Dial: Sunburst slate grey, luminous baton hour markers, white 1/5th second divisions, subsidiary dials at 6 and 9 for 12 hour recording and constant seconds, day and date aperture at 3, white pointed baton hands with luminous inserts, orange centre chronograph hands for seconds and minute recordingCase: Brushed and polished tonneau form, screw down back, crown flanked by twin chronograph pushersStrap/Bracelet: Black calf skinBuckle/Clasp: Gold plated buckleSigned: Case, dial & movementSize: 42mm