FHF 5, 19" H5.25

open face calibre These pocketwatch calibres were made with 18.5 und 19" . There are various bridge layouts, two base plates with differing dial-feet positions, and two slightly differing setting-lever springs. The assignment of such differences to the groups FHF 1 to 9 and the calibre FHF 2124 is just partially known. But comparing the according calibres gives an imagination. FHF 1 to FHF 16 designate movement groups containing calibres of different dimensions; individual designations start with FHF 22.