Uploaded September 2023 | Updated September 2026, 1 hour ago

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The Easy Adder by Kohner is a toy adding machine from the mid 1960s. It has a single dial like an old rotary phone with which you can add a digit to the total. It can also subtract.

Stephen Freeborn has a nice video of this machine: youtu.be/p_ilVETlMV4?si=gzvYTw1HJP2wqkfP

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

0:00 Introduction
0:16 Addition
0:46 Subtraction
1:21 Clearing
2:27 Mechanism
4:51 Outro