Cal. L102.1 is a hand-winding tourbillon movement from A. Lange & Söhne. It incorporates both hacking seconds and reset-to-zero functions, both highly unusual in a tourbillon watch.
- A. Lange & Söhne 1815 Tourbillon Handwerkskunst, Ref. 730
- A. Lange & Söhne 1815 Tourbillon, Ref. 730