https://en.wikipedia.org/wiki/Watchclock
I found the pre-electronic way of having a portable audit clock that had keys attached to buildings with numbers that would stamp the clock rather fascinating.
I found the pre-electronic way of having a portable audit clock that had keys attached to buildings with numbers that would stamp the clock rather fascinating.
That’s a later date than I would have assumed
http://www.centraltimeclock.com/security/watchclock.php (the brochure and manuals are interesting)
And an old one ( https://youtu.be/xwkIzphNFZY - annoying music)
Clock with a rotating piece of paper in it. When the key is turned, it alters (cuts / stamps) the paper.
The modern ones are modern made, but the design remains rather unchanged.