I have a Mustel harmonium for sale has been modified by a previous owner to function as an electric reed organ. It appears that all of the stops work and that the shades work well. It also appears to have many parts from the original purely mechanical pneumatics at the bottom of the case. However, I am not a harmonium expert and cannot guarantee that it all works perfectly nor that it contains all the parts necessary to restore it to purely mechanical non-electric functionality. It currently runs on 220v.
I have it priced at only 1995 Euro, which leaves the buyer with plenty of room for restoration expenses (a similarly-sized model sold on ebay for $4500 just last month). The harmonium is located in Los Angeles, California.