CERTINA, DS-2, Chronolympic, chronograph Case size: 42.5 x 40.5 (48) mm Material: steel Movement: manual, caliber 29-062 (Valjoux 726) Year: circa 1972 Crystal: plastic crystal Bracelet: leather strap Reference number: 8501.800 Serial number: 8726326 Case number: 8501.800(HF) Please keep in mind that an overhaul might be needed, since no service history is available.