u/Clumster

I am wondering if my recently bought lens is one of the radioactive ones? I was unable to find any info on it online as most talk about the M version or the Super Takumar. I understand that you can do a visual inspection of the lens but this seems rather inaccurate.

The version I have is the non M 28mm f/3.5. The lens ring text reads exactly..

SMC PENTAX 1:3.5/28 5361471 ASAHI OPT. CO. JAPAN

If you can't answer, do you know of a particular forum where they would know? I already tried Pentax support and they say they no longer have any records on what is what.