A timepiece movement includes: an hour wheel and pinion; a minute wheel and pinion; a winding stem; a time difference correction train; a date indicator; and a date change mechanism. The hour wheel and pinion includes an hour wheel that rotates with the minute wheel and pinion, an hour jumper, an hour jumper pinion, and an hour wheel body that turns with the hour wheel via the hour jumper and hour jumper pinion, and turns with the time difference correction train. The date change mechanism includes a date change wheel that turns with the hour wheel body, a date change lever, a date change cam that flexes the date change lever by rotating with the date change wheel, and turns in response to the flexed date change lever spring force, and a date change pawl that rotates with the date change cam, and advances the date indicator.

A time difference correction mechanism includes a cylinder index star wheel that includes teeth and is connected to an hour hand, a cylinder index gear that includes teeth and is connected to a minute hand, the cylinder index gear provided radially outward of the cylinder index star wheel on a same plane as the teeth, a cylinder index lever disposed in the cylinder index gear on a same plane as the cylinder index gear, and a cylinder index spring disposed in the cylinder index gear on the same plane as the cylinder index gear. The cylinder index lever is movable between an engaged position where a claw engages with at least one of the teeth and a disengaged position where the claw disengages with the at least one of the teeth . The cylinder index spring is configured to bias the cylinder index lever to the engaged position.

A retrograde timepiece display mechanism for a watch including a wheel for displaying information, this display wheel being driven by a drive finger carried by a wheel driven by a horological movement, in order to change the information displayed by the retrograde timepiece display mechanism from one value to the immediately following value, this retrograde timepiece display mechanism including also an intermediate correction device to manually correct the information provided by the retrograde timepiece display mechanism by acting on a correction finger which drives the display wheel, the retrograde timepiece display mechanism also including a safety device arranged to allow blocking the intermediate correction device by preventing the correction finger from driving the display wheel during a period of time when the change in the information displayed by the retrograde timepiece display mechanism occurs and when the drive finger is engaged with the display wheel.

A timepiece with a tourbillon unit, including a base plate, cage placed rotatably on the base plate and being connected to a fourth pinion, a balance placed on the cage, and an escape wheel that is placed on the cage and that is in work connection with the balance, a balance stop device being capable to be brought into engagement with the balance, wherein it further includes a zero-setting device for the angular orientation of the cage.

A timepiece with a tourbillon unit, including a base plate, cage placed rotatably on the base plate and being connected to a fourth pinion, a balance placed on the cage, and an escape wheel that is placed on the cage and that is in work connection with the balance, a balance stop device being capable to be brought into engagement with the balance, wherein it further includes a zero-setting device for the angular orientation of the cage.

A timepiece movement comprising a device for displaying the time in at least two time zones, the display device comprising a minute display member, a member for displaying the current hour representing a first time zone, a member for displaying the local hour representing a second time zone, the member for displaying the current hour and the member for displaying the local hour being superimposed, the movement further comprising a mechanism for setting the time in the second time zone, arranged to move the member for displaying the local hour, and a mechanism for synchronizing the member for displaying the current hour and the member for displaying the local hour, arranged to reposition the member for displaying the local hour so as to be superimposed with the member for displaying the current hour in order to leave only one hour-indicating member visible.

A notching system (100) including a spring (1) having a first toothset including n first teeth (11a, 12a) a first member (2) having a second toothset including m second teeth (22a, 22b), and a second member (3) mounted so as to be movable, in particular mounted so as to be rotatable, with respect to the first member (2), the first and second toothsets being arranged such that, through their interactions, they define p notches or indexed positions, the spring (1) including at least two elastic arms (11, 12), and at least one first pivot connection element (1b) between said two elastic arms (11, 12), the second member including at least one second pivot connection element (3b) cooperating with the at least one first pivot connection element (1b) in order to create at least one pivot connection between the spring (1) and the second member (3).