They're crackers

Snapped with a Takumar 55mm f2.2, early preset version.

 

This lens was manufactured from 1957. It was sold with the Asahi Pentax Camera (the 'AP'), and other early Pentax SLRs, as an alternative to the Takumar 58mm f2.

 

It’s a Gaussian design type, with 5 elements in 5 groups.

Done