Little round tin dexterity puzzles.
They are 4.5cm wide and rather good for people with confidence issues as you there are 3 little lead balls....
to get into..
.. 2 eye sockets...
very much weighted in your favour...
The (plain) boxes they came in had JAPAN on the label.
I found these in an old toy warehouse I cleared.
Lots more great things from the same source in my ebay shop.
I always combine postage - just ask before you pay.