Originally posted by mdudek Is it possible that it is fake? I'd appreciate any suggestions.
Hi, welcome to Pentax Forums!
It's probably not a fake. Two versions of this lens are shown here:
SMC Pentax-M 28mm F2.8 Reviews - M Prime Lenses - Pentax Lens Reviews & Lens Database
In particular: "This popular lens came in two nearly-identical variations, depending on the year of production. The second version had the optical formula of the smc PENTAX-A version and it also looks like an early A lens (no silver decorative ring)."
- Craig