A. Lange & Söhne L901.0

The L901.0 is a manual-winding movement made by A. Lange & Söhne, introduced in 1994 as the first caliber in the Lange 1 family. It beats at 21,600 vph with a 42-hour power reserve and features an outsize date display with the signature dragging mechanism, along with a power reserve indicator. The movement is produced in-house and was discontinued in 2015 when it was succeeded by later versions of the Lange 1 caliber.