Singular drive of the hour because not used in watchmaking. But Ulysse Nardin is using it in its luxury watches. This is a very simple model. Steelworkers will recognize the epicyclic train.
The motor Quartz located on the back drives the minute hand at the same time that the small sun gear 8 teeth. This pinion rolls the wheel 40 teeth in the fixed outer ring and therefore the hour hand. It is currently 11:16.
The frame is bamboo. The small gear is boxwood. Hands and wheel and crown wheel are birch aviation plywood. The pins are brass and chromed steel.
Let’s seein detail.
This post is also available in French.