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.
When the card is taken out of the envelope a ring revolves making a noise which frightens the person opening it. The ring is on rubber bands that need to be wound up before the card is put in the envelope. Inside is a picture of Chad and the message ‘Wot! Hav’yer been had?’. A BRITISH NU PRODUCT. The item was produced by a wholesale novelty company called Novelties Unlimited. This explains the NU trademark. The company was owned by Jack Klaw, who also traded as Klawvana. Unfortunately the ring and rubber bands are missing, but take a look at Ref. No. N1371 to see what should be there.