This is an authentic OMEGA Stainless Steel 39mm Speedmaster Date Chronograph Automatic Watch Blue 3511.80. This watch is crafted of stainless steel with a tachymetric scale on the bezel. Features also include a blue dial and a chronograph display of seconds, 30 minutes, and a 12 hour recorder. On the dial is also a date display at 3 o'clock. Follow this item for alerts. Omega is a registered trademark of Omega. FASHIONPHILE is not affiliated with Omega.