Uploaded December 2020 | Updated September 2026, 2 hours ago

---

The Contex A is an adding machine made in Denmark from about 1945 till 1952. The casing was then redesigned to make the Contex B which was produced until about 1970. Here I show three versions - a normal decimal one, one for sterling currency, and one for sterling currency with farthings.

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

0:00 Introduction
0:30 Addition
0:55 Sterling currency
2:00 Serial numbers
3:50 Clearing
4:10 Outro