#calibre 3861

The Omega Speedmaster and Rolex Daytona look like rival chronographs until you try to buy one. A working dealer's read on the two icons: the manual 3861 vs automatic 4131 movements, the head-to-head specs, and the enormous price-and-availability gap that makes the Speedmaster a buyable legend and the Daytona a multi-year hunt at double retail.

The complete 2026 Omega Speedmaster Professional Moonwatch buying guide. Every reference decoded: the current Calibre 3861 family (310.30.42.50.01.001 Hesalite, 310.30.42.50.01.002 Sapphire, 310.30.42.50.04.001 White Dial), the 2026 Reverse Panda releases (steel and Moonshine Gold), the previous-generation Calibre 1861 lineup, vintage 145.022 / 145.012 / 105.012 territory, and the limited-edition collector tier.