Jaap Scherphuis | The Add-em toy adding machine @jaapsch2 | Uploaded March 2020 | Updated October 2024, 1 hour ago.
The Add-em is a toy adding machine made by the Western Stamping Co. in the late 1950s or early 1960s. It has a 3-digit register, and simply 3 buttons to increment the digits.

To see the ingenious mechanism, see this other video:
youtube.com/watch?v=Yxu-selscMQ

For more information on this and other calculators in my collection, please visit my website:
jaapsch.net/mechcalc

0:00 Introduction
0:16 History
1:07 Adding
1:28 Carry mechanism
1:52 Clearing
2:10 Outro