Mighty Wizard.

DSC01631, a photo by a1scrapmetal on Flickr.

"Super Mighty" in fact.
"Its is one of the most helpful aid for your scientific study.!!"

MADE IN JAPAN>

Super Magnet (obverse)

DSC01630, a photo by a1scrapmetal on Flickr.

Bought from Partridge Novelties for 45 pence. It seems to have a London Phone number, but I can't remember said shop.

Key Caps

DSC01632, a photo by a1scrapmetal on Flickr.

Found in a box of treasure in the wardrobe.
Presented free with My Weekly.
complete with instructions how to slip it on your key. and the great phrase.
"NO MORE FUMBLING"

Key Caps

DSC01633, a photo by a1scrapmetal on Flickr.

In Blue, yellow or orange.