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Patek Philippe · Complications
The double-crown world time, dial enamelled by Patek's frequent collaborator on these pieces. The world-time mechanism itself is Louis Cottier's, the independent watchmaker whose system Patek used for decades and which every modern world-timer still descends from.
The 2523 was produced from 1953 to 1965.
The Patek Philippe 2523 runs the Cal. 12-400 HU, 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 Patek Philippe? Look up its serial number in the registry.