
The Omega Speedmaster Calibre 321 Chronograph 39 7mm (ref. 311.30.40.30.01.001) is a manual chronograph watch, with a 39.7mm stainless steel case, 13.7mm thick, powered by the Omega 321 movement and a 55-hour power reserve. Water resistance is rated to 50m, under a sapphire crystal, with chronograph complications. Manufacturer MSRP is $17,300.