This pocket tool was invented to make addition and subtraction easy on the fly. No paper needed, just a pen…that is also included. This Efzet is made of metal with metal tool in a cardboard wrapper. You return the numbers back to zero by pushing the bars that stick out back in. It shows some  signs of use and age but is working. Measuring ca. 11,5 cm or 4 1/2 inches high. Here you can find a vintage advertisement for a similar tool for the US.
Efzet FZ Addiator calculator tool pen 1940 Germany
€15.00
Efzet FZ Addiator calculator tool with pen, made in the 1940’s in Germany
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