A method for frequency tuning a set of plates of a watch. The plates are disposed one above the other forming a watch dial with a space defined between the plates. A mechanical shock to the set of plates is generated, and the vibration frequency of each plate is checked. The vibration frequency of at least one of the plates is matched if different from the other plate so as to obtain an identical vibration frequency for each plate in order to tune the plates at least according to the first vibration eigenmode so as to avoid any contact between the plates as a result of any mechanical shock.

A fastening method is for fastening at least one display element of a watch using a fastening device. Indeed, the at least one display element is fastened thanks to the fastening method via the fastening device. For this, it is necessary to provide the at least one display element, at least one movement, and at least one split ring, then to deform the at least one split ring so as to adapt to the at least one display element before fastening the at least one split ring with the at least one display element to the at least one movement.

A timepiece including at least analogue time display device, and an AM-PM display device for displaying day-night information in the dial of the timepiece. The AM-PM display device includes at least two apertures made in the dial of the watch, a rotating display disc bearing at least one first series of inscriptions corresponding to the day and at least one second series of inscriptions corresponding to the night, these two display series being disposed on at least two concentric circles, and a drive mechanism arranged so as to automatically and alternately bring the first series of inscriptions inside a first aperture and the second series of inscriptions inside a second aperture by rotating the display disc.

An analogue information display system for a watch provided with a mechanical movement includes a display dial including a plurality of apertures, a moving display part supporting graphical representations, disposed in such a way that the graphical representations supported thereby appear in the plurality of apertures in order to generate the information, and an indicator member configured so as to designate a piece of information generated in an aperture to be notified to the wearer of the watch.

An information display device includes: a position changing unit that changes a position of an information indicator in accordance with a type of information to be displayed by the information indicator; and an operation unit that causes the position changing unit to change the position of the information indicator that represents one type of information to a new position that represents another type of information, the operation unit causing the position changing unit to perform a movement completion operation for indicating to a viewer that the type of information displayed has been changed, in accordance with the another type of the information to be displayed when the position changing unit finishes changing the position of the information indicator to the new position.

A timepiece display device including a first display element and a second display element superimposed above a fixed part including a main bearing surface, this second display element is subjected to opposing forces exerted, on the one hand by lower return means which tend to bring the second display element closer to the first display element, and, on the other hand, by upper return mechanism which tends to move the second display element away from the first display element without contact between them or else by mechanical spacing device which includes a bearing surface providing a stop bearing function on a stop surface of the second display element, to limit the travel from the second display element to the first display element.

A device for selecting a combination of patterns for a timepiece, including an inner disc including N angular sectors of the same size, each bearing a symbol on its periphery, with N being a whole number greater than 1; an outer disc coaxial to the inner disc and with a larger diameter, the outer disc bearing M symbols distributed over M*N angular sectors of the same size, with M being a whole number greater than 1, each of the M symbols of the outer disc being repeated on N consecutive sectors of the outer disc; a dial extending opposite the inner disc, the dial including an aperture allowing a pattern of the inner disc to be matched with a pattern of the outer disc; an activation device allowing the inner disc to rotate and a meshing device coupling the two discs according to a speed reducing ratio M.

A device (100) for display of an indication of the time or derived from the time includes: a first display mobile unit (10) including a first toothing (11b), a second toothing (11c) and a first disk (12) carrying digits (13) intended to indicate the units of indication of time or derived from time; a second display mobile unit (20) including a third toothing (21b), a fourth toothing (21c) and a second disk (22) carrying digits (23) intended to indicate the tens of indication of time or derived from time; and a mechanism (90) for driving the first and second mobile that includes a command mobile unit (30) including a fifth toothing (30a) adapted to cooperate by obstacle, in particular by meshing, with the first and third toothings, and a second command mobile unit (40) including a sixth toothing (40a) adapted to cooperate by obstacle with the second and fourth toothings.

Jumper device (80) for a timepiece device (100) including at least one first arm (81) including a first beak (81a) for positioning a first mobile unit (10), at least one second arm (82) including a second beak (82a) for positioning a second mobile unit (20), an elastic element (84) for returning the first arm and the second arm to configurations positioning the first and second mobile units, and a lever (83; 83′) interfaced between, on the one hand, the elastic return element, and on the other hand, the first and second arms.