Yeah, didn't want to bore you guys with the story

The seller told me it came from a closed camera store out of some repair bin.
When I got it, I was confused because the glass is clear, aperture ring is nice, blades snappy and dry, but the focus ring stopped rotating before it gets to infinity.
When I turned the lens and examine the back, I found out the reason. There is a thin black metal ring that is warped that it blocks the optical assembly from moving (towards film plane) beyond a certain point.
So I carefully took the ring out (three tiny screws), hoping that I can straighten it out, but it's so messed up, so I just leave it out. Tried the lens on my E-620 via adapter, the pictures looks fine, no light leaks and the lens fit just fine (no play or wiggle).
Then I tried it on the OM-3, and the above pictures are the results.
