The Buser 105 watch movement was produced between 1889-1893, with approximately 2250 units manufactured during this period. It has an open face calibre design and features a bimetallic screw balance with 4 adjustment screws, as well as a Breguet hairspring. The movement also incorporates a barrel with Geneva stopwork configuration. It is worth noting that the Buser 105 movement shares similarities with the IWC 52 19'''H5 movement. The functions of this movement include stem winding and pin set for time adjustment, as well as a sub-second display.