The Jaeger Lecoultre 412 watch movement, which was used approximately in the 1960s, is a manual wind movement featuring a sub-second function. It is equipped with Incabloc Shock Protection, ensuring enhanced durability. Variations in the combined setting for the escapement wheel and/or mobile stud carrier exist in later samples of this movement. Moreover, there may be differences in bridge shapes between the 4200-4202 and 4205-4207 designations, although specific details are unknown.