Omega Speedmaster Moonwatch 3873.50.31 Men's Watch. 42mm Stainless Steel case. Stainless Steel Tachymeter bezel. Black dial with Luminous Steel hands and index hour markers. Minute markers on the outer dial. leather strap with Buckle. Will fit up to a 7.5-inch wrist. Additional stainless steel bracelet included. Scratch Resistant Sapphire Crystal, Sapphire case back. Calibre 1863 Automatic self-winding movement with a 48-hour power reserve. Original Box & Papers included. This watch is backed by our two year warranty.