Here's an interesting one, the Yashica YF.
Yashica bought out Nicca, an innovative Leica-clone maker, and did them one better with this camera, which crammed a really impressive list of features into a largish LTM body. Unfortunately they did this in 1959, the year the Nikon F changed all the rules and marginalized the market for highly featured RF cameras.
It has lever wind inside the body instead of on top, which looks a bit odd but works very smoothly, and a hinged back flap just like the Leica M's. This has little ball bearing snaps at the bottom holding it in place; I understand the very earliest M3's had the same but eliminated it (I wonder why?) The combined VF/RF has true projected auto-parallax framelines for 50 and 100mm lenses, with the full field being right for 35's. The finder is extremely bright and clear, not quite M-level, but close. This camera is a real pleasure to use.
I don't know anything about the lens, a 50mm f1.8 Yashicor. It's a bit on the largish side, and takes 43mm filters. Everything is dead smooth, and it appears to be extremely well made. I'm going to have to run some film through the camera as soon as I can stop playing with it.
The one thing it unfortunately does not have is a single shutter speed dial, but a Barnackian rotating fast speed dial and a slow speed dial on the front. Also on the front is a chromed aluminum bezel around the VF/RF windows, which is, um, different. Note that the camera carries both the Yashica and Nicca brands: I would like to know the thinking behind that. The overall body size is almost identical with that of an M-Leica.
The build quality and finish seem better than other Niccas. Like other Niccas, it has the large brass slow speed escapement which looks to be bulletproof.
I was quite lucky with this camera, and picked it up on ebay in non-functional condition. It turned out that one of the shutter tapes had come unglued from the wind-side rollers. The camera is quite easy to service, and with the tape fixed and a general CLA done, I now have an extremely nice example of this rather rare camera.
Cheers,
Dez