I bought this Sun Opt. 85-210mm f4.8 tele and a K1000 on ebay about ten years ago. The name and CDL number is etched on the lens. Once I got my K10, I had the focal range already covered so the lens has been sitting for a very long time apart from a few experiments with reverse mounting.
Craig if you are still out there and shooting Pentax, these are for you.