OMEGA, Speedmaster, chronograph Case size: 42 mm Material: steel Movement: manual, caliber 321 Year: circa 1967 Crystal: plastic crystal Bracelet: leather strap Reference number: ST 105.012 Serial number: 24.532.253 Case number: 105.012-65 (HF) Please keep in mind that an overhaul might be needed, since no service history is available.