Abstract: A timepiece capable of selectively showing a before-noon display or an after-noon display. A cam (26) is driven by an hour wheel (10) and an intermediate wheel (12) to make one rotation a day in the counterclockwise direction. During before-noon hours, a lever (20) remains in contact with a larger diameter portion forming part of the cam (26). At 12.00 noon, the lever (30) reaches the transition point of the cam where the larger diameter portion merges into a smaller diameter portion. As the cam (26) further rotates in a direction of an arrow (FB), the lever (30) is instantaneously shifted from the larger diameter portion to the smaller diameter portion of the cam (26) by the action of a spring (34). The shift of the lever (30) is transferred to a movable dial plate (36) via a tooth section (31) provided at the end of the lever (30) and a switching groove (39), so that the dial plate (36) is rotated by a predetermined angle in a direction of an arrow (FC).