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Tudor · Submariner
The Tudor Submariner that served with the US Navy and, in other references, the French Marine Nationale. Military-issued examples are the ones that established Tudor's tool-watch credibility, and the Black Bay line is explicitly built on their design language.
The 7928 was produced from 1959 to 1968.
The Tudor 7928 runs the Fleurier 390, 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 Tudor? Look up its serial number in the registry.