The invention relates to a timepiece comprising a time train, a 31-toothed wheel,
a wheel of units of 30 teeth plus a space corresponding to a tooth which is used
to drive a star-wheel of units and a four-toothed wheel for driving a star-wheel
of tens, a year cam which is solidly connected to a wheel, and drive means for
driving said 31-toothed wheel by one revolution per month and the year cam by one
revolution per year. The aforementioned 31-toothed wheel is solidly connected to
a corrector element. The drive means comprise a cam which is solidly connected
to a wheel, a driving yoke, elastic means which are used to press said yoke against
the cam, a corrector yoke, a feeler which is arranged to detect the position of
the year cam and elastic means in order to connect said yokes to one another.
