The strange thing is, although it is common to accept that the 105.003, 105.012, and 145.012 are the true Moonwatch models, these references are the least expensive caliber-321-powered Speedmaster Professional watches you can buy. Speedmaster 105.012 The real Moonwatch models The lug spacing remained 19mm and the lug-to-lug is 48mm. The black bezel also changed the diameter of the watch from 38.6mm to 39.7mm. Where the first Speedmaster had a bit of a military look, in my opinion, this watch is a more subtle sports chronograph. This particular reference number already looks a bit like the “Moonwatch” with its black bezel and Alpha hands. This is often considered the second-best thing when it comes to vintage Speedmasters. It was first introduced in an all-platinum version of the Moonwatch, then in January 2020 in a steel “Ed White” case. Then, in 2019, Omega announced the return of the caliber 321. This Lemania (based on the caliber 2310) movement went out of production in 1968 when Omega introduced the Speedmaster Professional 145.022. The CK2915 houses the Omega caliber 321 with a column-wheel chronograph. Be very cautious when you find one on offer. There is so much money involved in these very first models that it also attracts people whose intentions are not always honest (newly made cases, movements from other watches, refitted bezels from a later period, and so on). More importantly, perhaps, try to find an original one that has not been tampered with. If you are looking for a CK2915, expect to pay a fortune ( recent results have skyrocketed the price of the CK2915). The CK2915 has multiple versions (you will find a -1, -2, or -3 added to the reference number) that could, more or less, be considered small updates. In the first three generations of Speedmasters, the lug spacing and lug-to-lug length do not change. The first Speedmaster has a diameter of 38.6mm, a lug spacing of 19mm, and a lug-to-lug length of 48mm. The chronograph was also useful for those who needed to time events and tasks outside of sports. The watch was advertised with racing cars, but the chronograph was useful for many other sports as well. Initially, the Speedmaster was meant to be a sports chronograph, using the dashboard clocks of Italian sports cars of that time as an inspiration. Together with the Seamaster 300 (CK2913) and Railmaster (CK2914), this model was part of this professional trio featuring curved lugs, a black dial, and broad arrow hands. The very first Speedmaster that Omega introduced in 1957 had reference CK2915. Two generations of Moonwatch models, current (left) and previous (right) Speedmaster CK2915 Piguet-based 33xx movements, the Speedmaster caliber 9300 (Dark Side of the Moon, etc.), Racing Caliber 9900 models, and so on for this Omega Speedmaster Guide.
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