Have I acquired a rare and valuable melodeon? A "Patent BOS Melodion - Made in Germany". Boasts "Broad Steel Reeds" (which are not on individual plates, but on 4 large plates). The knobs operate different registers, and the air button also operates an internal bellows lock. It seems to be in the keys C#/D - destined for the Irish market?
The fact that the word "Melodeon" is also spelled "Melodion" on the same instrument would suggest that QC was not great, so I probably should hold off on ordering a new Ferarri, until Melnet experts confirm it's provenance.