between Ludwig Oechslin, Paul Gerber, and Christian Gafner to support the Musée International d‘Horlogerie (MIH) in La Chaux du Fonds. The watch is a unique annual calendar that uses gearing instead of springs to make it work (As a result, it can be set backwards as well as forwards). In addition, Gerber has kept the chronograph function of the base ETA 7750 movement and implemented a minute counter in the back of the watch and a single pusher chronograph. Hope this helps.