Abstract: A watch according to an embodiment of the present disclosure includes a first pointer, a first magnetic body fixed to the first pointer, a second magnetic body arranged facing the first magnetic body, a first shaft body fixed to the second magnetic body, and a wheel train mechanism including a first rotary wheel interlocked with the first shaft body.

Abstract: A pointer device including a rotation body, a pointer shaft provided on the rotation body, a base member which rotatably supports the pointer shaft, and a spiral spring which has a substantially truncated conical shape and is arranged between the rotation body and the base member.

Abstract: A detection unit detects light passing through apertures provided in a seconds wheel, a center wheel and an hour wheel, respectively, which rotate on the same axis. The apertures in the seconds wheel include a circular aperture provided at a reference position therein, and two apertures provided separated by corresponding arcuate apertures of different lengths from the aperture on its opposite sides, respectively. By counting the number of light non-detection events the detection unit encounters due to the light blocking area covering the detection unit, the rotational position of the seconds wheel is detected accurately and securely.

Abstract: A detection unit detects light passing through apertures provided in a seconds wheel, a center wheel and an hour wheel, respectively, which rotate on the same axis. The apertures in the seconds wheel include a circular aperture provided at a reference position therein, and two apertures provided separated by corresponding arcuate apertures of different lengths from the aperture on its opposite sides, respectively. By counting the number of light non-detection events the detection unit encounters due to the light blocking area covering the detection unit, the rotational position of the seconds wheel is detected accurately and securely.

Abstract: A timepiece with a calendar function. The timepiece includes a main plate (19) has a plurality of holes (76) arranged along the outer periphery of a ring-like day indicator (26) when the same is disposed concentrically on the main plate. When positioned, the day indicator (26) is disposed substantially concentrically with the main plate (19). When a plurality of guide pins (77) are inserted into the plurality of holes (76), respectively, in the main plate 19, the guide pins (77) cooperate to come into contact with the outer periphery of the day indicator to adjust the position of the day indicator (26) in radial directions, thereby positioning the day indicator exactly concentrically with and on the main plate (19) (FIG. 18).