Panagor Auto Tele 200mm f/3.5 (M42)
Thanks for posting this. I think this lens is an unknown gem for those who like manual focus and iris. My copy has a quite loose aperture ring which moves when knocked. I've used it on a Nikon 1 V1 and a Sony A7. Sample image below is (I think) at f8 or f11 which is what I normally use this lens at.