Moon phase display mechanism

A moon phase display mechanism configured 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 provided on 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 transparent support,
• a shutter, and
• drive means configured 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 an aspect of the Moon which changes from a new moon to a first quarter moon, then from the first quarter moon to a full moon, then to a last quarter moon and finally to the new moon, and
• the shutter being returned by the drive means from the final position of the shutter to the initial position of the shutter at an end of the lunar cycle.