A VRML (Virtual Reality Modeling Language) model of the famous Curta mechanical Calculator.
The real thing was produced from 1946 until 1972 in Liechtenstein.
This is just a video of the model.
You can find the model by searching for Curta in Wikipedia. There you find a link to the model under External Links. Look for YACS.

Olaf Veenstra
The Netherlands
2008