ZERO RESET Patented mechanism that simplifies the synchronisation of the watch with a time signal. When the crown is pulled, it automatically causes the seconds hand to jump to the 12 o'clock (zero) position.

Sapphire crystal Glass made of artificially produced sapphire. It is very hard (9 on the Mohs scale) and scratch-resistant. It ranks just below the diamond in these two respects.

Three-quarter rotor A special winding rotor in the LANGEMATIK. Its diameter is more than 25% smaller than that of the movement, so it does not conceal the balance wheel while its motion is being observed through the sapphire-crystal caseback.

The ANNIVERSARY LANGEMATIK is an extraordinary masterpiece with an exquisitely designed enamel dial. At the same time, it is a Lange signpost that points against the ubiquitous principle of rationalisation to which so many traditional crafts and time-consuming techniques have fallen victim. It takes craftsmanship honed over several centuries and about 30 meticulous steps for an emailleur to create a flawless and authentic enamel dial. Lange's dedication to historic authenticity also embraces seemingly minute details such as the separately imprinted and separately stoved red numeral XII. | Blued steel hands with polished "eyes", the classic small seconds hand with the | ZERO RESET feature, and the "chemin-de-fer" style chapter ring round out the face of a timekeeping instrument that builds a credible bridge to the very origins of watchmaking. In keeping with its classic style, the ANNIVERSARY LANGEMATIK stands out with a precious platinum case. The | sapphire-crystal caseback reveals the self-winding Lange L921.7 SAX-0-MAT movement with its bidirectionally winding | three-quarter rotor made of 21-carat gold and platinum. The ANNIVERSARY LANGEMATIK was crafted as a limited edition of 500 watches in the period from 2000 to 2004.