Uploaded April 2023 | Updated September 2026, 4 minutes ago

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"De Kleine Rekenmeester" means the little accountant. It is an educational toy produced by J.B. Wolters in the early 1950s.

Stephen Freeborn has a nice video of it too:
youtu.be/4GeRfLF2F8I

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

0:00 Introduction
0:35 Unboxing
0:51 How to use it
2:03 Manufacturer
2:57 Bosatlas
4:24 Dating
4:56 Mechanism
6:40 Outro