Abstract: Moon phase display mechanism comprising an input pinion which makes three revolutions, respectively two revolutions, in 24 hours, and drives a 19-tooth or respectively 29-tooth drive pinion, which drives a 59-tooth lower wheel bearing a moon disc with a two-coloured depiction including a lighted area and at least one background sky area and also drives a 57-tooth or respectively 58-tooth, upper wheel, coaxial to this lower wheel and which makes one revolution per day and which includes a sky disc with a depiction of the sun, and an aperture opposite this sun, through which is visible one part of this moon disc illustrating the current appearance of the moon.

Abstract: Timepiece wheel with play take-up, including a toothing, each tooth of which includes first and second half-teeth each including a part of the tooth profile, and movable with respect to each other against elastic return means, the wheel including, axially stacked, a first and a second half-wheel respectively carrying the first and second half-teeth and having limited rotational mobility with respect to each other, about the axis of this toothing, and against the elastic return means, the toothing of each half-wheel overhanging the other half-wheel, each half-wheel including hollows inside each of which is movable an opposite half-tooth, between two successive half-teeth.