Orient Multi Month Calendar Power Reserve
Cal. EX01

The famous Magic Lever

developed by Seiko in the 70ies. I had no clue that Orient also used the same system. As you can see from the wheel next to my copyright mark, the toothing is special. This shape of the wheels together with the two spikes of the magic lever will allow the magic lever wheel to turn only in clockwise direction if looked from this perspective. Regardless of the moving direction of the rotor, the magic lever wheel can only move in clockwise direction and will then transfer this momentum to the main barrel. This is probably one of the least expensive and smartest winding systems devised.