Demon jumping disc novelty

When you indent a disc and place it on a flat surface, after a while it will spring back into its original position and jump several feet into the air. Advice on how best to make it jump may be found here. The Davenport demon trademark is stamped into the disc.

Details

Size Disc diameter 26mm.
Date First half of the 20th century.
Organisations
Key Phrases ,
Category
Ref no N2555