The dramatic and enduring design of the OMEGA Constellation is characterized by its famous half-moons, “claws” on the case and mono-rang bracelet. This 39 mm 18K yellow gold model features a bezel engraved with Roman numerals, an opaline white silvery dial and a date window at the 6 o'clock position. The hands, OMEGA logo, Constellation star and indexes are all in 18K yellow gold. At the heart of this timepiece is the OMEGA Co-Axial Master Chronometer Calibre 8801, visible through the domed scratch-resistant sapphire crystal. Caliber  Movement: Automatic Power  Reserve: 72 hrs    Case  Case Material: 18k Gold Stainless Steel  Case Diameter: 39mm  Bezel Material: Stainless Steel  Dial Material: Sapphire Crystal  Dial Color: White    Bracelet/Strap  Bracelet Material: 18k Gold Plated Stainless Steel  Bracelet Color: Gold, Rose Gold Clasp: Deployment Clasp