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A. Lange & Söhne · Lange 1
The reference the company restarted on. Calibre L901.0 was Lange's first movement in over forty years, and it set the construction rules everything since has followed: a three-quarter plate rather than separate bridges, untreated German silver that oxidises to a warm tone instead of being plated, and a balance cock engraved by hand — so no two are identical, and the engraver's work is the one part of the watch that cannot be repeated exactly.
The A. Lange & Söhne 101.021 runs the L901.0, 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 A. Lange & Söhne? Look up its serial number in the registry.