Abstract: A timepiece such as a watch carries a date ring with a window display. The ring carries an engaging system capable of driving at the end of each month an annual ring having twelve or twenty four external teeth and five internal teeth. A calendar driving wheel set has a first finger capable of driving the date ring and a second finger capable of driving the annual ring. At the end of a month of thirty days, one of the five internal teeth of the annual ring appears on the path of the second finger and drives this ring in its travel, such ring, from being driven becomes a driving wheel and, via the engaging system, causes the date ring to advance to the first of the following month. A manual correction remains necessary at the end of the month of February.

Abstract: The annual calendar mechanism includes a calendar driving wheel (18) provided with a finger (17) adapted to drive a date wheel (19) through one step at the end of each month. An annual wheel (25), driven through two steps once per month by a long tooth (23) borne by an intermediate wheel (21), itself meshing with the date wheel (19), includes a plate (27) bearing five teeth (28). If one of these five teeth, corresponding to one of the months of less than thirty-one days, comes into the path of finger (17), the annual wheel, from being driven, becomes driving and drives the date wheel through an additional step via the intermediate wheel.

Abstract: The invention concerns a timepiece including a horometric movement (M) with a dial train (8, 46), at least one hours hand (4) which is mounted on an hours pipe (4a) driven by the dial train, a rotary ring (48) driven by the hours pipe so as to effect one revolution per twenty-four hours, a first display means (3) including a twenty-four-hour hours circle and a second display means including geographic indications respectively indicating various time zones, one of the display means (3) being arranged on the rotary ring (48) in order to be displaced facing the other (5) and in order to furnish with the latter a universal time display, characterized in that it includes a correction mechanism (MC) adapted to act on the hours hand (4) independently from the driving of the rotary ring (48).

Abstract: A timepiece including: an inner hours pipe (2) supporting a lower wheel (6), an outer pipe (30) mounted on the inner pipe (2) and supporting an upper wheel (32) arranged above the lower wheel (6), a star (12) mounted on the hours pipe (2) and fixed in rotation to the lower wheel (6), two driving rollers (20) cooperating with the star (12) and driven by the upper wheel (32) and a spring (26) bringing back the roller (20), such timepiece being characterized in that the lower wheel (6), which constitutes an hours wheel in mesh with a dial train, is mounted to be free in rotation relative to the inner hours pipe (2), while the upper wheel (32) forms a correction wheel capable of acting on the hours pipe (2) in order to modify the hour displayed.

Abstract: This invention concerns a compass watch as well as a bezel specifically intended to fit out such a watch. The invention comprises at least one time indicating element (4) kinematically driven in rotation by a mechanical or electromechanical horometric movement, and particularly intended to be pointed towards the sun, and direction indicating means (N, S, W, E) arranged on said watch enabling one to know, as a function of the orientation of said indicating means (4), the direction of at least one of the cardinal points, and is characterized in that it includes correction means (52; 16, M) for the positioning of the cardinal points, adapted to take into account the equation of time and to correct any variation between true solar time and the legal or local time of day. The invention is applied to a watch, preferably of the mechanically or electromechanically driven type.

Abstract: A timepiece including automatic backward moving display means. Such invention includes: a horometric movement, an intermediate wheel (22) driven by the movement and including driving gear teeth (26a-26y), a display system (16) for information such as the date, at least one oscillating element (30) coupled to the display system (16) and including driven gear teeth (32) in mesh with the driving gear teeth (26a-26y) of the intermediate wheel (22), return means (34) for the oscillating element (30), declutching means (40, 40a) to enable the oscillating element (30) to effect a free backward motion, and an abutment (B) associated with a counter-abutment (CB) in order to limit the backward movement of the oscillating element (30), this invention being characterized in that the counter-abutment (CB) is formed by one (26a) of the driving gear teeth (26a-26y) of the intermediate wheel (22) which, during driving, normally meshes with the driven teeth (32) of the oscillating element (30).

Abstract: The invention concerns an astronomic timepiece enabling a simple display of the daily value of an astronomic magnitude having an annual cycle. The timepiece comprises a month disc (13), at least a portion of which is visible through an opening (19) provided in the dial (6). The development of the astronomic magnitude is represented in the form of a curve (25) in a frame of reference one coordinate of which indicates the date and the other indicates a value of the astronomic magnitude.