Very Rare , Fully Serviced, Never Polished Fully Original , Certina Chronolympic Reference 8501-503 . Produced between 1968 to 1972 this example is in true vintage condition, never polished and with all the signs of usage from this years. With a generic steel bracelet and buckle. The Manual winding movement was fully serviced. The rAre Valjoux 726 caliber . Watch: Certina Chronolympic Ref:8501-503 Case: Steel 38mmx44mm Movement: Manual winding, caliber Certina 29-062 (Base Valjoux 726) Crystal: Mineral Dial: Original Blue with white sub dials Crown: original Certina Accessories: NO box or papers Box: We provide a comfortable travel service box Warranty: We provide our 12 month service warranty We ship worldwide with insurance .Any customs and import costs are buyers responsibility.