Vintage Certina DS-2 Chronolympic Swiss Ref 8501.800 Valjoux 726 Wrist watch, The original black dial with silver sub dials and matching hands with orange lolly pop chrono hands is signed Certina DS-2 Chronoolympic T-swiss made-T. The large 43mm steel case with screw back is signed on the back Certona DS 8310904, unpolished. The Cal.726 Valjoux movement manual wind movement is working well, although not serviced by us and may need a service to keep perfect time. Start stop reset works well as it should. Selling as traded unpolished!