Uploaded May 2022 | Updated September 2026, 2 minutes ago

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This adding-listing machine was made by Serio in Italy from about 1960 till 1965. It is manually driven, and handles subtraction and negative totals.

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

0:00 Introduction
0:20 Input
0:40 Addition
0:55 (Sub)total
1:59 Non-add
2:24 Subtraction
2:50 Negative totals
3:31 Multiplication
4:50 Ink ribbon
6:20 Opening case
7:05 Outro