Omega Constellation Series 39mm Observatory Watch.Case: .- Watch size: 39mm .- 1. Made of 316L stainless steel, while the rose gold version features PVD 18K specially refined Omega rose color.- 2. The bezel is engraved with Roman numeral markers, and the classic semi-circular facets and double eagle claws are restored on the side of the case.- 3. The front and back are made of arched, double-sided anti-reflective and scratch-resistant glass, providing excellent transparency.- 4. The stainless steel model features a black sunburst dial, while the rose gold version perfectly replicates the original classic satin-finished blue dial.Movement: .- The stainless steel model is equipped with a customized version of the 8800 movement, which maintains the original appearance. Both the main plate and the rotor are adorned with Arabesque-style Geneva waves.