My understanding is that the main factory (Alfred Arnold?) for bandoneons ended up east of the wall dividing Germany after WWII and production more or less ceased, leaving most bandoneons in South America during the postwar folk revival and, subsequently, more or less unknown among the mainstream of that revival's subsequent development until tangos and Argentinian music started appearing in what we are pleased to call World Music.

When I can fit it into the car with the rest of my clobber, I play English dance tunes on mine.

Cheers, Rowan