Omega Speedmaster '57 Chronograph 40.5mm

This watch features a 40.5mm stainless-steel case, stainless-steel bracelet, front sapphire crystal, and sapphire crystal exhibition caseback. Screw-down caseback. 50-meter water resistance. Green dial with chronograph and date functions and luminous hands and markers. Powered by Omega manual-wind co-axial master chronometer caliber 9906 with 60-hour power reserve. 20mm lug width.