The Omega Constellation Co-Axial Master Chronometer (ref. 131.23.39.20.02.001) is a refined, unisex timepiece featuring a 39mm steel and rose gold case and a classic silver dial. Powered by the automatic caliber 8800, it offers a 55-hour power reserve. This elegant watch boasts 5 ATM water resistance and a sapphire crystal. A brown leather strap with a buckle clasp complements the design. While this listing is for a used, very good condition watch, Geneva Watch Company can procure this model. This Constellation, complete with original box and papers, represents Omega's commitment to precision and contemporary design