I recently bought a lot of 3 original Diana cameras from South America and got to test them. The one with the best lens has a permanent light leak which I can't find the source of (naturally!) but the others are fine and still work very well. They all have a very unique look and are a lot of fun to use. The cameras are probably from somewhere around the 60's though it's very hard to tell as the design remained the same throughout it's production.
Diana 1: Tri-X400 developed in Rodinal 1:25 because I was in a hurry!
Diana 2: Tri-X 400 developed in Caffenol CL semi-stand. this was a bit of an experiment with process as I hadn't developed Tri-X in Caffenol and had read many people saying it didn't work well. I found a process that was recommended at http://caffenol.blogspot.com.au/2011/08/and it didn't turn out too badly. I'll probably choose Rodinal in future specifically for Tri-X though, but it was very much useable.
This is the camera with the light leak. I patched it up somewhat in Photoshop in these ones, but more of the images just didn't work well because of it.
Diana 3: Tri-X 400 developed in Rodinal 1:50 (my usual)