The Girard Perregaux 31 watch movement, used approximately in 1975, features an automatic mechanism and a jeweled lever. It includes a sweep second (disc) and a digital display for the second, minute, and jumping hour. Notably, late samples of this movement may have glued hairspring terminals and a stem mechanism without a setting-lever spring. In addition, it is worth mentioning that the train and hand gear are oddly driven separately by the barrel. However, it is advised to refrain from further elaboration on these peculiarities.