Map Watch

The Vacheron Constantin engineers and watchmakers added to an extremely reliable self-winding movement, Vacheron Constantin Calibre 1126AT, a complication necessary to make the time move in the cartographical wake of the famous adventurers. The highly sophisticated and patented mechanism drives both dial parts with help of a number of complicated devices linked by cams featuring the shape inspired by the Vacheron Constantin signature Maltese cross.

The hour wheel has three arms extended by a satellite, each carrying four hour numerals, pointed in the direction set by a cam. The hour crown turns so that to line up the satellite with the necessary hour number in front of the gap found between the two dial parts. The cam then moves the necessary number into the gap and the hour crown makes it move from left to right in precisely one hour over the minute scale featured on the lower dial. (Link)