Timepiece with an hour hand able to be moved forward or backward by one hour step

Time zone timepiece including an hour hand (6) capable of being moved forward or backward in one hour steps by means of a manually actuated time setting stem (28) without affecting the minute display, said hand (6) being fitted onto an hour pipe (4) about which an hour hand (2) is adjusted to pivot freely, driven by a motion work (10), an additional wheel (12) secured to the pipe (4) driving an additional device, the hour wheel (2) being coupled to the additional wheel (12) by a limited torque mechanism (16), the timepiece being characterised in that, outside the periods in which the time zone time is being corrected, the hour wheel (2) and the additional wheel (12) are further rigidly coupled by a second coupling mechanism.