Patent ID: 8416645

Claim:
A time zone mechanism, arranged for displaying, on demand, the time in a particular time zone, on the main hands of a timepiece, including a movement, the time zone mechanism comprising: (a) at least two programmable and reprogrammable memory wheels that mechanically store user inputted settings, wherein each memory wheel includes (i) a wheel, wherein the wheel includes means for rotational driving about an axis of rotation; and (ii) a heart-piece that is reversibly movable by pivoting between at least two indexing positions of the wheel; (b) support means arranged for disconnectably cooperating with a support surface of each of the memory wheels, and, between two actions by the user, connectably cooperating with the support surface of one of the memory wheels and being then disconnected from the support surface of the other memory wheels; and (c) a differential gear with two inputs and one output, wherein a first input is formed by a motion work wheel set, wherein the motion work wheel set is disposed to be driven by the movement, wherein a second input is formed by a crown of the differential gear, wherein the output includes a cannon-pinion or an arbour carrying an hour hand, and wherein each of the memory wheels meshes with the differential crown either directly or indirectly via the drive means.