Abstract: A method of placing under a protective atmosphere a watch case fitted with its movement, includes: installing the watch case in the housing of a support including a unit for holding the watch and a unit for guiding an actuator acting on a part of the case; introducing the support into a flexible pouch; installing the support in the open pouch in a device for imposing a protective atmosphere; reducing the pressure within such device; closing the pouch containing the support; extracting the support from the sealed pouch of the device for imposing a protective atmosphere; closing the watch case by acting on the actuator via the outside of the pouch in order that it displaces a part of the watch according to the guide unit in order to close the watch; opening the pouch and separation of the actuator from the part of the case on which it acts.

Abstract: The method for adapting a timepiece movement provided to operate at ambient atmospheric pressure so as to operate in a low-pressure atmosphere comprises the following steps: 1. measuring the quality factor of the movement at atmospheric pressure, 2. measuring the quality factor of the movement at a predetermined low pressure corresponding to the operating pressure intended for the modified movement, 3. calculating the energy gain between the two measurements, 4. adapting the dimensions of the movement based on this energy gain, in particular by modifying at least one of the following elements of the movement: the reduction ratio of the finishing going train, the torque of the barrel, the size of the barrel and the inertia of the balance.

Abstract: The oscillating mass able to be fixed to a frame (1) pivoted on the exterior of a timepiece movement has toothing kinematically connected to the ratchet of a barrel of the timepiece movement. This oscillating mass has, on the one hand, a mount (4) which is annular or is in the form of an annular sector and is able to be fixed to the frame (1) and, on the other hand, a central part (7) located mainly or exclusively in one half of the surface delimited by the mount (4).

Abstract: The going train for a timepiece has a mechanical movement having a frame (0), a barrel (1) and an escapement pinion (5) which are connected by the going train. This going train has a stepping-up epicyclic train having a first planet gear (6) with a constant rotational speed during normal operation of the movement, a second planet gear (7) kinematically connected to the escapement pinion (5), at least one satellite gear (9) each meshing with the first planet gear (6) and the second planet gear (7), and a satellite carrier (8) kinematically connected to the barrel (1) and carrying the satellite gear(s) (9).