Uploaded July 2021 | Updated September 2026, 1 hour ago

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This Sterling Dial-A-Matic adding machine is a simple rotary adder with six dials and a clearing lever. It was first produced in the mid 1950s.

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

0:00 Introduction
0:10 The box
0:58 Models
1:19 Stylus
1:37 Addition
2:14 Clearing
4:08 Subtraction
5:05 Outro