This Large stainless Steel Military Style wristwatch case is 44 mm wide excluding winder, The High Quality Swiss Unitas movement is stamped Star watch Co. The manual winding movement has 17 Jewels, Incabloc Shock Resistance and Tyrcal power reserve of 44 hours in between windings. This watch is a Unique conversion of a High quality Vintage Unitas Pocket watch Movement into a Large Wristwatch case. Each watch is checked for Defects, oiled and Timed for accuracy. Watches are waterproof. If Not completely satisfied, the watch can be returned for refund within 14 days.