Harmonetta

Depressing a key makes it possible to play all notes of that pitch class; which octave sounds depends on where the mouth is positioned on the mouthpiece.

There were other location-specific versions of the Harmonetta released, including the French-designated one, in which the buttons say tone names such as "Do Re Me" instead of "C D E".

Starting on the 2nd generation models, the case was changed to a zipper and the "made in Germany" stamping appeared on the top cover.

The later Harmonettas (1960s and newer) featured white rings around the "E" keys, in the center of the instrument and had black internal Bakelite parts.

Common problems with the Harmonettas include failed (dried) windsavers, broken gaskets, glue failing to hold the windsavers on, sticky sliding counterparts, cracked/chipped mouthpieces, and the screws holding the brass shutters falling out.