The Favre Leuba 257 watch movement encompasses various balance staffs, with slight differences that can still be utilized or modified, even if a "wrong" staff is employed. The movement's designations, such as 175, 176, 179, 184, 191, 196, 204, 232, and 235, possibly refer to distinct bridge shapes in the catalog. This movement is equipped with manual winding, a sub-second function, and variations that include both sweep seconds and non-sweep seconds. Additionally, it has a calendar feature.