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Omega · Seamaster
231.13.39.21.55.001 is an Omega Seamaster Aqua Terra reference, in production since 2015.
The case is 39mm stainless steel.
It runs the Cal. 8520, an automatic movement.
Catalogued dial colours: silver / white, blue.
It is the 16th of 25 Seamaster references in the catalogue by production start.
Crossover 39mm Aqua Terra with a diamond-set mother-of-pearl dial.
The 231.13.39.21.55.001 has been in production since 2015.
The Omega 231.13.39.21.55.001 runs the Cal. 8520, an automatic 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.