Hearty Greeting card joke

When you take the card out of the envelope a metal ring revolves, powered by rubber bands, and makes you jump. Made by Klawvana, England. The company was ran by Jack Klaw, who also traded under Novelties Unlimited.

Details

Size Envelope size 105 x 90mm.
Date Probably mid 20th century.
People
Organisations ,
Key Phrases
Category
Ref no N1371