A. Lange & Söhne L121.1

The L121.1 is a manual-winding movement manufactured by A. Lange & Söhne, introduced in 2015 as the second generation of the Lange 1 caliber family. It features a jumping outsize date mechanism and a free-sprung balance, delivering a 72-hour power reserve. The caliber replaced the earlier L901.0 and remains in production, powering the Lange 1 and Little Lange 1 collections.