123.20.38.21.02.006 Omega The Omega Constellation Co-Axial Master Chronometer 123.20.38.21.02.006 is a luxurious watch with a 38 mm stainless steel case and an 18K yellow gold fixed bezel that is engraved with Roman numerals. The crown of the watch is also made of 18K yellow gold. The dial is white opaline-silvery and features 18K yellow gold hour indexes and luminous hour markers. The hour hands are skeletonized and also made of 18K yellow gold. Similar to the previous watch, this one also has a date window located at the 3 o'clock position, and it performs several functions including hours, minutes, seconds, and date. The Omega logo is located below the 12 o'clock position. The watch is powered by a self-winding movement with a Co-Axial escapement that is powered by the calibre 8500. The power reserve of the watch is approximately 60 hours. The case thickness is 12.5 mm, and the case back is transparent. The watch features sapphire crystal on the front and back to protect the watch. The bracelet is made of stainless steel and 18K yellow gold, and it has a folding buckle. The water resistance of the watch is up to 100 meters, making it suitable for swimming and snorkeling but not for diving. Overall, the Omega Constellation Co-Axial Master Chronometer 123.20.38.21.02.006 is a high-end watch that combines luxury materials, precise timekeeping, and sophisticated features. It offers a unique blend of stainless steel and 18K yellow gold, which makes it stand out among other watches.