The Record 31 is an open face calibre pocketwatch movement available in 18.5''', 19''', and various heights ranging from 4.2mm to 5.9mm. It features options such as a bimetallic screw balance and a Breguet hairspring. The movement includes different bridge layouts, two base plates with varying dial-feet positions, and two slightly differing setting-lever springs. While the exact assignment of these differences to the FHF groups and calibres is only partially known, comparing the corresponding calibres provides an idea. The Record 31 movement is stem wind and set, with a sub second function. It was primarily utilized around the period of 1940.