My first (and probably only) Leica-copy which takes the honest-to-god Leica-thread 39mm screw-mount lenses. I have a couple other cameras which take 39mm screw mount, but the thread pitch is incompatible.
There's a surprising amount of stuff on the internet about the Fed line of cameras; it's very well regarded.
I haven't tried anything with it and probably never will. But it looks great on the shelf.