Omega Speedmaster ref 3513.50.00 with date display and 39mm case is a must-have for any well-rounded Omega collection. It has the same functionality as the famous Moon Watch, but is packaged in a smaller case and features a steel bezel instead of the traditional black bezel and a vertical tri-compax dial to accommodate the date display at 3 o'clock. The case is worn on the supremely comfortable older-style Omega three-link bracelet with brushed and polished center links and a reliable clasp. The case also features a fixed Tachymeter bezel calibrated to 500 kilometers, side pushers, and a scratch-resistant sapphire crystal. The Caliber 1152 is based on the widely celebrated Valjoux 7750 and boasts automatic winding technology and a 46-hour power reserve.