I know, it's probably silly to ask about a strange set of shutters without showing them in a picture, but they're not with me right now and I'd like to get a sense of the interest/knowledge-base out there before I bring out the digi-tool and get some snaps of them. I will post an image of them next weekend. There are 5 of them, in a well made, hinged box that resembles a flute case, obviously made for these shutters. They are heavy brass or bronze (about a pound apiece), measure about 3.5 in. across the body and have 2 wires coming from each of them. I've taken one apart, as far as I could without going crazy, and they appear to be simple electromagnets, which respond to a DC charge of 12v by opening- as long as the current is applied. The rage of f/stops on each is identical; 6.8, 8, and 11. They have serial/model numbers on them that are different but I cannot find any differences in the shutters themselves. For the life of me, I cannot imagine these things in use on any camera I have ever seen, but they must have been quite expensive when they were new, perhaps in the 20's or 30's, judging from the workmanship and the case. Any ideas?