The ref. 112.021 Lange 1 was a limited edition of 100 pieces that was in the A. Lange & Söhne collection from 1998 to 2000. It features a solid gold dial with guilloché pattern and several parts of its movement are done in solid gold as well. It was introduced in 1998 to commemorate the opening of a new, second, production building for the A. Lange & Söhne manufacturer.
