Pentax 50mm F2 is the standard partnering lens with the Pentax K1000. An excellent all round performer for general photography. In A condition optically and cosmetically.  You can buy this lens for your K-mount or choose the option of adding a K&F precision PK-E adapter which enables this lens to be mounted on Sony E-mount, focus peaking cameras Both lens caps.

Pentax - M 50mm F2 K mount S#8411599