Omega 3594.50.00 (Pre-owned - Good) — USD 4,425 on eBay

The Omega Speedmaster Professional Moonphase, Reference 3594.50.00, represents a distinctive complication within the esteemed Moonwatch collection, produced between 1997 and 2003. This particular reference builds upon the iconic Speedmaster Professional lineage, integrating an astronomical display that pays direct homage to the watch’s lunar heritage, offering collectors a more complex and visually rich interpretation of the legendary chronograph. Adhering to the classic Speedmaster Professional aesthetic, the watch is presented in a robust 42 mm stainless steel case, maintaining the instantly recognizable asymmetrical profile and twisted lugs. A striking black dial provides the canvas for the chronograph registers and the prominent moonphase aperture, which typically resides at 12 o'clock, creating a harmonious balance between the timekeeping, chronograph, and celestial functions. The design ensures excellent legibility while retaining the tool-watch character that defines the Speedmaster series. Driving the Speedmaster Professional Moonphase is the manual-winding Omega Caliber 1866. This sophisticated movement is a direct descendant of the legendary Caliber 1861, itself an evolution of the Caliber 861 that powered the Moonwatch for decades. The Caliber 1866 ingeniously incorporates the moonphase complication into the chronograph architecture, providing precision timekeeping alongside its complex functions. The construction of the timepiece offers a water resistance of 50m, underscoring its robust, if not strictly dive-oriented, capabilities. As a variant of the Speedmaster Professional, the Reference 3594.50.00 holds a special place for enthusiasts who appreciate both the historical significance of the Moonwatch and the added romanticism of a moonphase display. It showcases Omega's continuous innovation within its most iconic line, offering an alternative to simpler Professional models and distinguishing itself from other specialized Omega chronographs such as the split-seconds Rattrapante or the distinct racing-inspired Mark II. Its relatively limited production period further enhances its appeal among collectors seeking a unique blend of heritage and horological complexity.