Omega 3520.50.00 (Pre-owned - Good) — USD 2,710 on eBay

The Omega Speedmaster Reference 3520.50.00 represents a notable divergence from the iconic manual-wind Professional "Moonwatch" lineage, establishing itself as a sophisticated automatic chronograph with a comprehensive full calendar display. Emerging as part of the "Speedmaster Day Date" series, this reference offers collectors a blend of the Speedmaster's legendary sports watch aesthetic with enhanced daily utility, distinguishing it from the simpler Speedmaster Date models or the smaller Speedmaster Reduced variants. It firmly positions itself as a more complex and functionally rich option within the extensive Speedmaster family. Encased in stainless steel, the 3520.50.00 presents a dynamic black dial adorned with a wealth of information. Its layout incorporates chronograph subdials for 30-minute and 12-hour elapsed time, alongside a continuous small seconds indicator. A central chronograph seconds hand sweeps across the dial, while the tachymeter scale, a hallmark of the Speedmaster, is prominently displayed on the bezel. This particular Speedmaster stands out with its full calendar functionality, featuring both day and date apertures, complemented by a 24-hour indicator, often integrated within one of the subdials or as a dedicated hand. Powering the Speedmaster 3520.50.00 is an automatic movement, a significant departure from the manual-winding calibres found in its Professional counterparts. This choice of movement underscores its design as a practical, everyday companion, providing the convenience of self-winding alongside its intricate array of complications. With a water resistance rating of 30 meters (100 feet), the watch maintains a practical robustness for daily wear. For collectors, the 3520.50.00 is appreciated for its unique position within the Speedmaster family, offering a compelling combination of historical design cues with a more complex and feature-rich mechanical execution, appealing to those who value versatility and a broader spectrum of horological functions beyond pure chronograph timing.