Foolestroupe and Bob, yes I recall Polly's little decorative 1920s white Hohner piano accordion, which she has apparently now sold. A 2 reed, 2 octave treble, C to C, and 8 "mushroom" buttons on the bass, giving F, C, G and D notes and majors, same note push and pull, though construction and tone definitely owed more to melodeon than piano-accordion technology.

I've seen this same model on eBay from time to time; I think they made quite a lot of them.

Sorry, what was the question? ;-)

MC