Abstract: The present invention concerns a timepiece such as, in particular, a wristwatch, including a watch movement, a running equation of time device, as well as a date mechanism, this timepiece having a pair of hour (22) and minute (24) hands which indicate the civil time, and an additional minute hand (28) which indicates the true time, the daily position of the true time minute hand (28) with respect to the civil time minute hand (24) being determined by the position of an equation of time cam (32) driven in rotation at the rate of one revolution per year by a date mechanism, characterized in that the true time minute hand (28) is driven by a differential gear (50) which has for respective power take-off a gear train (52) driving the civil time minute hand (24) and a transmission member which co-operates with the equation of time cam (32) to transmit the pivoting movement of said cam (32) to the input of the differential gear.

Abstract: The present invention concerns a power reserve indicator device (1) for a manually or automatically wound timepiece, said timepiece including a barrel, a mainspring housed in the barrel and time display elements mechanically coupled to said barrel, said indictor device (1) including a differential gear (10) a first input (8) of which is driven by a winding gear train (6) which meshes with a first driving gear formed by the barrel core, the output (16) of said differential gear (10) driving a display gear train (18) for indicating the reserve of power assured by the number of winding turns of the mainspring, characterised in that the second input (14) of the differential gear (10) is driven by a letting down gear train (12) which meshes with a second driving gear formed by the outer toothing of said barrel or by a wheel and pinion driven by said barrel.

Abstract: The present invention concerns a timepiece such as, in particular, a wristwatch, including a watch movement, a running equation of time device, as well as a date mechanism, this timepiece having a pair of hour (22) and minute (24) hands which indicate the civil time, and an additional minute hand (28) which indicates the true time, the daily position of the true time minute hand (28) with respect to the civil time minute hand (24) being determined by the position of an equation of time cam (32) driven in rotation at the rate of one revolution per year by a date mechanism, characterized in that the true time minute hand (28) is driven by a differential gear (50) which has for respective power take-off a gear train (52) driving the civil time minute hand (24) and a transmission member which co-operates with the equation of time cam (32) to transmit the pivoting movement of said cam (32) to the input of the differential gear.

Abstract: A date movement for a clockwork movement including a member (8) for indicating the tens having four positions carrying a scale from <<zero>> to <<three>> or from <<one>> to <<three>> plus a blank, provided for effecting one step every ten days, and a member (10) for indicating the units arranged for effecting one step per day, characterised in that the units indicator member (10) can occupy thirty one positions and carries three successive scales from <<zero>> to <<nine>>, one of the three scales, called the modified scale, having an additional <<one>> inserted between its <<zero>> and its <<one>>.