Omega Seamaster Calendar Bumper

Omega Seamaster Calendar Bumper

During World War II, Omega shifted their efforts towards producing simple and reliable timepieces at large scale for various militaries. After the war, Omega resumed their production of consumer pieces with a new approach: the new post-war Omegas were notable for their clean, legible dials and stalwart movements, making them a popular choice for a sharp-looking everyday watch.

Of particular note in the post-war years was the introduction of the iconic Seamaster line in 1948, so named for its then-innovative waterproofing. Over time, the Seamaster name was applied to a variety of pieces with waterproof cases, from simple, time-only pieces to full-fledged dive watches. The introduction of the Seamaster Calendar in 1952 marked the first time an Omega wristwatch would feature a date window. 

The Omega Seamaster Calendar (Reference 2627) is also notable for its use of the automatic "bumper" wind movement. In a typical automatic movement, the rotor would rotate a full 360°. But in a "bumper" movement, the oscillating weight would "bump" against springs on either side of the weight, thus restricting its rotation to 130°. This wasn't a new technology, having been used in pocket watches, but brands like Jaeger-LeCoultre and Movado also used it in their wristwatches. Though designed to be more efficient, the bumper-wind calibers were costly to produce, and the bumper wind Seamasters had a short run.  

While vintage Omegas, and Seamasters in particular, have gained in popularity thanks to their affordable prices and classic looks, it has also made finding worthwhile examples a bit more difficult. This Seamaster calendar, dating from the earlier part of production, has a handsome case capped in rose-gold. But don't let its appearance fool you--this watch, with its sturdy movement that's been recently serviced, can withstand anything you put it through, and will be a faithful companion in your day-to-day life.


Two-tone rose gold-capped case is approximately 35mm (excluding crown). Omega Reference 2627-11SC, Omega Caliber 355 Automatic Bumper-Wind Movement, Circa 1950s.

Overall Condition: Two-tone rose gold-capped case is in excellent condition with sharp lugs and only minimal signs of use and wear consistent with handling. Dial is in very good condition with some signs of use and wear in keeping with its age. Dial does show some signs of age including fine even patina overall and slight signs of oxidation to the hour markers and hands. Omega crown; insignia on caseback has rubbed off but is still faintly visible.

Includes one 18mm dark brown analog/shift leather strap and two 18mm nylon straps from Crown & Buckle

SKU: TT01071

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