I had one of these as a kid.
A miniature plastic bible.
They appear to be still around, in various colours too!
They were very tiny.
This one's by Cosmo ( found online, not my hand!)
The secret was inside seen through a small peep hole.
The Lords Prayer no less!
It appears that the magnification was all possible via a miniature Stanhope lens.
Stanhopes got around.
Here's a metal Chrysler Building TV viewer.







