Ebauches SA prototype, Certina Chronolympic, valjoux 728
Extremely rare Ebauches SA (ESA/ETA) prototype for Certina, first Certina Chronolympic Regatta ever produced, powered by one of the rarest valjoux movement.
Column wheel movement ESA Valjoux 728, based on the valjoux 72 with the minute chronograph counter placed in the center.
Manual winding. No date
Center Chronominute and seconds
Hour counter at 6
Production date estimation 1971
Case size without crown W40xH44mm
Provided with is NSA Bracelet and a leather bracelet