Zenit Helios-44M 58mm F2 Swirly Bokeh M42 Screw Mount Lens -Read, As Is-
This is the bang for buck swirly bokeh champ. Unfortunately, this one has a few condition issues. There are a few fine marks on the front and rear elements as well as an internal one that may soften your images slightly. It is also missing the switch to switch the aperture from manual to automatic, it closes down with the aperture ring rather than from the camera. There is also oil on the aperture blades but they open and close smoothly, it does not affect their function.
Otherwise the lens is in good condition and works perfectly! Get a good deal on a nice lens!