I don't own this one, it's PHSNE's. I have a number of backs myself–with and without dedicated flanges, however, so I don't need it. I'm just surprised at what it is given there was no Galvin camera in the collection that included this back. It was a big lot of cameras that had belonged to a man who never told his wife that he was collecting. There were literally hundreds of good cameras in the house and garage after he died. His widow has entrusted PHSNE to get rid of them. We've had three auctions and sold much of the stuff quietly on the side, netting her thousands of dollars. I'm doing what I can to help out.