The Gangreserve was issued in 2005 to commemorate the 100th anniversary of the founding of Chronometerwerke Hamburg. Chronometerwerke Hamburg GmbH was founded in 1905 by seven prominent Hamburg shipbuilding firms to design and manufacture high precision nautical chronometers. The company was purchased in 1938 by Herbert Wempe and the name was changed to Wempe Chronometerwerke. During the second World War, Wempe Chronometerwerke collaborated with A. Lange & Söhne to produce standard chronometers for the German navy. In 2005, eleven watch companies issued limited editions to celebrate the 100th anniversary of the founding of the original company, with all the LEs being sold exclusively through Wempe. This particular model was produced; 100pcs in yellow gold, 100pcs in Platinum and 25 pcs in rose gold. Automatic Lange Cal. L921.6, the superlative Sax-0-Mat movement with zero seconds reset. 343 parts, 42 jewels, and a gold rotor with platinum edge. The Sax-0-Mat beats at 21,600 vph, with a power reserve of 48 hours. The Platinum 950 is in 40.6mm, price at the time was US$39,700.00