This 28mm is a Takumar-branded Pentax lens. The Takumar items were non-SMC (coated) lenses sold aftermarket or with some of the lower-end Pentax bodies.
This ‘A’ model is compatible with ‘Program’ mode Pentax bodies like the Program A and P30 etc. It’s P/KA mount.
Condition: The optics are clean, no fungus or significant dust (none can be seen at listing time). The barrels and body is in great condition and focus action and aperture setting is positive and smooth.