Bob and Dazbo - thanks for all that information.

I bought my wife a little Hohner 1928 *white/stylised blue flowers* 2-reed 2-octave 12 bass piano accordion last year - all it needed was a few valves replacing and it plays fine. The bellows, keyboard and body are all in near-new condition. The basses are conventional 12-bass piano accordion - major chords and tonic for Bb F C G D and A. The piano keys are just a bit slimmer and taller than the ones on her 1950's 12-bass Bell "working" accordion. I think it's a little jewel.