Abstract: A timepiece having a pivot supporting an hour hand, a coaxial shaft supporting a minute hand and a dial, having hour and minute indicia and openings corresponding to time zones. A gearwheel having a number of teeth corresponding to the number of time zones, is supported on the pivot and bears a disk having time-zone indicia. A first elastic element biases a radially movable body towards the gearwheel. A cam acts on the body every hour to move it against the biasing action of the first elastic element to a disengagement position, whereat the first elastic element causes a snap-action movement of the body towards the gearwheel. A pawl pivoted to the body is radially aligned with a tooth space of the gearwheel by a second elastic element. The resultant rotational traction of the gearwheel corresponds to a one-hour movement of the disk and the time zone indicia.