Zenith Sporto Wrist-Watch Case Steel at 1958 silver-plated dial with hours-indexes and figures 3,6,9,12 gold-plated Movement, Hand-winding, Cal. 40 Movement under additional plexi-glas monometallic screw-balance, flat-balance-spring 17 Jewels Diameter of case: approx. 37mm brown-leather-bracelet, 18mm