The ingenious perpetual flip calendar from the 1920s


#1

Originally published at: https://boingboing.net/2018/03/02/the-ingenious-perpetual-flip-c.html


#2

Totally going to 3dPrint this. Any votes for color combos?


#3

The green of your avatar circle with bright neon orange numbers!


#4

Guess I need a better avatar :rofl:


#5

I love these! I have a few now from the Flea Market.
So cool to see the patent .


#6

This topic was automatically closed after 5 days. New replies are no longer allowed.