8,2 / 10
First Omega model with date
This Omega Seamaster Calendar is a very nice example of the second generation, reference 2757, fitted with caliber 355.
All its parts are conform and the watch is in overall great condition considering its age.
It is fitted on a new leather strap with an original stainless steel Omega buckle.
About the model
The Omega Seamaster Calendar is an historically significant watch. and was a technologically advanced piece for its time.
The brand introduced the earliest Seamaster watches in 1948, just a few years after the end of WW2. During the war, Omega produced watches for various armed forces. The brand developed a few innovative features for military pieces – like water-resistant housings – that eventually went into production with early, regular Seamasters.
Only four years later, in 1952, the first Omega featuring a date came to the market: it was the first Seamaster Calendar, reference 2627, fitted with caliber 353.
The reference 2627 was proposed in stainless steel or 14k gold-capped steel case. With a width of 35mm, and long chamfered lugs (the lug-to-lug length is actually 42.5mm). this watch had a great presence on the wrist.
The case back is screw-in (threaded) to ensure waterproofness, and the original Omega clover leaf crown is screw-down.
The bezel is beveled and it holds in place a reinforced crystal. The water resistance was 30m, which might not seem like a lot today but in was a depth rating in the early 1950s. Together with a date complication and an automatic movement, it made this model quite exceptional at that time.
Only two years after reference 2627 debuted, Omega released another model that looked almost the same: it was the reference CK 2757 powered by caliber 355.
While the 2627 had a threaded case back, the new 2757 had a press-in case back, with the same water resistance (30m). Otherwise, the two watches were very similar.
As often for Omega vintage models, the Seamaster Calendar most crucial element was its dial, proposed either in white or black versions, with similar features:
- an applied logo at 12 with the text “Omega” and “Automatic”,
- a date window at 6 with “Seamaster” and “Calendar” above it,
- applied markers either in gold or silver color.
The date aperture, which had a frame matching the indexes, logo, and hands’ tone, could have 2 different shapes:
- the very early models had a square date window,
- from 1953 onwards, Omega changed that to a trapezoid shape.