Moon phase display mechanism

A moon phase display mechanism intended to be moved by a horological movement, said moon phase display mechanism comprising a transparent support provided with an upper face and a lower face which extends at a distance from the upper face, a representation of the Moon being transferred to one of the upper or lower faces of said transparent support, a substrate being disposed under the transparent support, at a distance from the lower face of the latter, the moon phase display mechanism also comprising a shutter as well as drive means intended to be moved by the horological movement, and arranged to drive the shutter in displacement between the transparent support and the substrate, the shutter and the substrate having display contrasts which are inverted relative to each other, the shutter being displaced from an initial position to a final position for a duration of a lunar cycle, so as to reveal day after day to an observer the aspect of the Moon which changes from the new moon to the first quarter moon, then from the first quarter moon to the full moon, then to the last quarter moon and finally to the new moon, the shutter being returned by the drive means from its final position to its initial position at the end of the lunar cycle.