Hmmm. Never seen one with that configuration, but now I understand your E problem :-)
My comments about moving left hand reeds around still apply though. In fact, I wonder whether a previous owner might have had something similar done to produce the non-standard buttons it now has? Or whether Hohner may have done a batch like that at a particular retailer's request?
Some of the pre-war Hohners are truly beautiful works of art. I currently have a 140 bass Hohner L'Organola from 1938 in pieces all over my workshop....in poor condition, but much too pretty to scrap!

MC