Bell Punch Company Limited model Plus, mechanical calculator. The steel case is painted with a green "hammered" effect paint.
A metal plate with text is fixed to the back of the calculator: Kantoormahine Import Procento.
I don't think it actually works but it's definitely a lovely, decorative bit of industrial design.
The photos are part of the description.
Dimensions: length 24.5 cm, width 18.5, and 12 cm high.
Weight: 3.22 kg.
Shipped by registered mail.