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Patek Philippe · Complications
5905/1A is a Patek Philippe Chronograph Annual Calendar reference.
The case is 42mm stainless steel.
It runs the Cal. CH 28-520 QA 24H, an automatic movement.
Flyback chronograph with annual calendar, sunburst olive green dial.
The Patek Philippe 5905/1A runs the Cal. CH 28-520 QA 24H, 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 Patek Philippe? Look up its serial number in the registry.