The Unitas 6486 watch movement is an open face calibre that offers multiple options including a bimetallic screw balance and a Breguet hairspring. This pocketwatch movement comes in different sizes with heights ranging from 4.2mm to 5.9mm, and diameters of 18.5 and 19'''. The bridge layout, base plates, and setting-lever springs vary slightly across different models. While the exact assignment of these differences to the FHF groups and calibres is only partially known, comparing the respective calibres provides some insight. The Unitas 6486 movement belongs to the FHF 1 to FHF 16 movement groups, distinguished by their dimensions, with individual designations starting from FHF 22. Designed around 1940, this movement features stem winding and setting, a sub-second hand, and other functions (not further elaborated).