Developed and produced by Kenissi, the Fortis Manufacture Calibre is the perfect addition to our established collections of robust, luxurious and precise timepieces. The Manufacture Calibre WERK 13 offers an integrated GMT function with a jumping +hour feature that allows the wearer to easily set the local time and change the date forward or backward at any time of the day. The WERK 13 offers an impressive 70-hour power reserve so the wearer can remove their everyday Flieger on Friday evening and put it back on Monday morning without having to wind it or reset the time. The WERK 13 has been designed and thoroughly tested for ultimate robustness and reliability. This is exemplified by the traversing balance bridge with a two-point fixation which improves shock resistance and allows precise positioning of the oscillator. The WERK 13 Manufacture Calibre is certified as a chronometer by the Swiss Official Chronometer Testing Institute (COSC).