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Omega · Speedmaster
The first Speedmaster, from 1957, part of Omega's professional trilogy alongside the Seamaster 300 and the Railmaster. It was designed for motorsport timing, not space — the tachymetre scale on the bezel was the innovation, being the first chronograph to put it there rather than on the dial.
The CK2915 was produced from 1957 to 1959.
The Omega CK2915 runs the Cal. 321, a manual movement.
Look up the watch's serial number in the Watch Safe registry to see whether a record exists or a theft flag is attached. A registry search identifies records for a specific serial; it does not authenticate the watch. Authentication is performed in person by an independent expert authenticator, and Watch Safe records and publishes the result.
Checking a specific Omega? Look up its serial number in the registry.