G'day ...Oh good! It worked (spelled: I didn't stuff up the html this time).
I should have said (were I not preoccupied with html), that the illustrations not particularly related to your mystery box. There is a sketch by me of a 1-row 'melodion' and a catalogue illustration of a 2-row 'Vienna style' ... and both are fairly small web-sized images. Anyway, the article should be of interest ... if not relevance.
Regards,
Bob Bolton