The Omega Seamaster Railmaster XXL Chronometer (Reference 2806.52.37) is a prominent, discontinued mechanical watch from Omega's Seamaster Aqua Terra family. Originally launched around 2003–2004, it is widely recognized for bridging the aesthetic gap between a massive wristwatch and a classic pocket watch, offering a distinctively oversized presence on the wrist.

• • Case Diameter: 49.2 mm, with a thickness of 12.5 mm and a substantial 56 mm lug-to-lug dimension. 

  • Movement: Powered by the Omega Calibre 2201, a manual-winding, COSC-certified chronometer movement built upon the reliable Unitas 6498-2 pocket watch foundation. 

  • Power Reserve: Features a 53-hour power reserve and operates at a smooth 21,600 vibrations per hour (3 Hz). 

  • Dial: Glossy black lacquer dial with painted luminous triangular markers, Arabic numerals at 12, 3, and 9, and a recessed small-seconds sub-dial positioned at 6 o'clock. 

  • Water Resistance: Rated for 15 bar (150 meters / 500 feet), utilizing a non-screw-down crown. 

  • Strap & Clasp: Paired with a 24 mm brown alligator leather strap and a stainless steel twin-trigger foldover deployant clasp.

  • Caseback: Transparent sapphire exhibition caseback, showcasing the machine-finished movement decorated with Geneva waves (Côtes de Genève) and gold-plated engravings. 

Unlike the historical 1957 Railmaster models designed for rail workers, this XXL reissue swaps the traditional anti-magnetic soft iron inner cage for a sapphire exhibition back to celebrate the pocket-watch-derived mechanics.