Jaap Scherphuis | The Everest Z5R calculator @jaapsch2 | Uploaded April 2022 | Updated October 2024, 1 minute ago.
The Everest Z5R is a mechanical calculator made in Italy in the 1950s. It was made by S.A. Serio in Crema. The design is generally similar to the Facit TK, so it uses a pinwheel mechanism, has a 10-key keyboard, and an internal carriage.

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

0:00 Introduction
0:17 Inputting numbers
0:43 Addition
0:55 Multiplication
1:37 Subtraction
1:47 Shortcut multiplication
2:19 Clearing
2:37 Counter direction
3:45 Division
6:47 Back Transfer
8:43 History
10:24 Outro