oris star automatic mechanism swiss made hand winding immaculate mechanism please see photos two color dial cord original calendar at 3 o'clock safe case diameter with crown 39.88mm case diameter without crown 37.7mm explanation Hello, thank you for your interest in my watch, Oris STAR. Automatic movement, practical calendar, seamless steel case, double dial color, original strap buckle, strap may be attached later, there is no problem in the operation of the watch, it will be shipped within three days after sales.