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Chadwick Adding Machine

Chadwick Adder -- Japanese Adding Machine

Chadwick Adding Machine (Japan)

The numbers are dialed by hand. tens carry is automatic. The red plastic handle on the right clears the result register (see photo below for a clearer shot).
Here is jazzy minimalist(!) video from apparently the same model (jamacdonald on

(if video won't show, enable javascript and download the latest Macromedia Flash Player)

This Japanese adder was apparently marketed under a variety of names -- Solo Adder, Neckermann Haushaltkalkulator -- or at least these appear very similar:
Neckermann Haushaltkalkulator - Mechanical Adder - Plastic Adding Machine

Solo Calculator - Mechanical Adder - Plastic Adding Machine