This is a Helios 44 series 58mm F2 prime lens. It's a famous old lens known for its swirly bokeh. Please note that it is a Sony α E-mount, although the M42 mount is not available in this size. I purchased this as a used item from an auction site. I am selling it because I have had fewer opportunities to use it. The body has a general used feel with small scratches. There are small scratches and dust particles on the lens, but no mold or clouding. The helicoid and aperture blades function without issue. The only included accessories are those in the photos (front and rear caps); there is no box or case. It has been stored in a dehumidified storage box, but please understand that this is a used item and has been stored by a private individual. Thank you for your understanding and consideration before purchasing.