I recently purchased a box of goodies which ended up containg mostly odds and ends of what was someone's Leica collection. Lots of filters, hoods, that kind of thing. Also included was an odd collapsible pop-up viewfinder which I believe likely came from a rangefinder of some sort, although I have never seen one like this. I guess of could also be from a folding camera perhaps. Anyway, I have included 3 photos for you to see and would appreciate any feedback as to what camera it belongs to, or frankly, any identification you may have. Thanks.