Pentax 35/2 M42 lens, this lens is about 50 year old, still can use on M42 bodies. Now I put a 35mm RF adapter it can be used on Leica M with rangefinder coupled, fron 0.7m to infinity. Lens in good condition, no fungus or scratch.
When use this lens on Leica M, you need to set the lens focusing to infinity and use adapter helicoid rf focusing, and you may also both focusing for close up shooting.