Always good performers, this Helios prime is a cracking example.
I always show test photos taken with the lens I'm offering, check them out above, good all round performers but particularly for portraiture. 
This lens is in about as good condition as you will find.
Glass is scratch/mark/haze/fungus free with absolutely minimal dust that is visible to the naked eye.
Focus is lovely and smooth and the aperture blades are clean/dry and oil free and operate as they should.
Externally in pretty good condition, again check the photos posted of the actual lens on offer.
With the correct adapter this m42 screw will fit most modern day dslr's/mirrorless cameras.
The images shown above taken with lens on a canon dslr.