ID: 
2426
Maker's Name: 
Unknown
Dimensions: 
4.4 × 4.4 × 4.3 cm

The gear wheel is connected to a helical sring wrapped around the shaft. When the shaft rotates in one direction, the helix unwinds and the gear is not rotated. When the shaft rotates in the opposite direction, the helix winds up and grips the shaft allowing the gear to rotate.