0MGVA SpdM M4n Pro Stn Steel Blk Dial Auremont

The Speedmaster Professional holds singular status in watchmaking history as the only timepiece worn during all six Apollo Moon landings — certified by NASA in 1965 for all manned space missions following rigorous testing against extreme temperature, pressure, vibration, and acceleration. It remains qualified for NASA spaceflight to this day. Reference 310.30.42.50.01.001 represents the current "hesalite" execution introduced in 2021 alongside the new Calibre 3861, faithfully preserving the original Moonwatch specifications: the hesalite plexiglass crystal that won't shatter in vacuum, and the solid steel caseback bearing the embossed Seahorse medallion — the configuration that NASA originally approved for orbital and lunar use.

The 42mm asymmetrical case in stainless steel measures 13.18mm thick, framed by a black anodized aluminum bezel bearing the tachymeter scale and the famous "dot over 90" detail. The matte black step dial features applied Omega logo, printed luminescent hour markers, and a tri-compax chronograph layout with small seconds at nine, thirty-minute counter at three, and twelve-hour counter at six. The manual-winding Calibre 3861 — Co-Axial Master Chronometer certified by METAS and anti-magnetic to 15,000 gauss — delivers a 50-hour power reserve, completed by a brushed stainless steel five-arched-links bracelet with foldover clasp.