Omega Constellation Series 39mm Observatory Watch.Case:.- Watch size: 39mm.- Crafted from 316L stainless steel; the rose gold version utilizes PVD 18K custom Omega rose gold.Bezel:.- Engraved with Roman numeral scales and features the classic semi-circular facets on the side of the case, along with double eagle claws.Glass:.- The front and back are made of curved, double-sided anti-reflective, scratch-resistant glass, providing complete transparency.Dial:.- The stainless steel version features a black sunburst dial, while the rose gold version perfectly replicates the classic satin-finished blue dial of the authentic model.Movement:.- The stainless steel model is equipped with the custom version of the 8800 movement, which has a design that matches the original. The plates and automatic rotor are adorned with Arabic-style Geneva waves, showcasing exquisite craftsmanship.