black caliber 9901
The calibre 9901 is individually produced for us in the watchmaking town La Chaux-de-fonds. All of the parts are black-coloured. This automatic chronograph movement is equipped with a column-wheel and coaxial escapement. It is resistant to magnetic field up to 15,000 Gauss. The calibre has a silicon balance spring, two serially mounted barrels and a time zone function. It also has central hour-, minute- and chronograph second hands, as well as a small second indicator. The calibre has a power reserve of ca. 44 hours. Loss of accuracy is -1 to +5 seconds per day. Revisions are recommended every 3 to 8 years.