Abstract: This relates to a calendar display mechanism for a clockwork movement, including a day-of-the-month wheel intended to actuate a month wheel at the end of each month, the month wheel including a year cam that has n series of graduations, each of which is associated with a particular year, each series of graduations having a number m of graduations corresponding to the number of months in the associated year, the display mechanism including a rotatable month lever which supports a month feeler-spindle thereon which remains in contact with the year cam so as to define the angular orientation of the month lever, the lever also having a kinematic connection to a month display wheel so as to cause the wheel to perform a retrograde movement.

Abstract: A display mechanism a wheel carrying, constrained to rotate with it, a first wheel and a snail-shaped cam, the mechanism having an active first state in which the first wheel is driven in rotation by a driving wheel and a zero reset second state in which it is no longer driven to allow it to return to a predefined position, associated with a predefined position of the display member, the display mechanism further including a feeler-spindle adapted to cooperate with the perimeter of the cam, the feeler-spindle and the perimeter of the cam being adapted and sized so that the feeler-spindle exerts on the cam, in the second state, a return force having a non-radial component adapted to return the first wheel to its predefined position.

Abstract: A coupling system for a chronograph mechanism is presented. The system can include an input wheel intended to be driven by a drive member; an output wheel intended to drive at least one display member; an intermediate wheel continuously kinematically connected to the input wheel or the output wheel, where the intermediate wheel changes between a coupled state where the input wheel is kinematically connected to the output wheel and an uncoupled state where the kinematic connection is broken. The system also includes a first friction wheel constrained to rotate with the intermediate wheel and a second friction wheel constrained to rotate with either the input wheel and the output wheel; a first safety wheel constrained to rotate with said intermediate wheel that includes a first set of safety teeth; and a second safety wheel constrained to rotate with the second wheel that includes a second set of safety teeth.