I've seen this guy riding this OG 1982 Patterson PR200 around my neighbourhood.
I don't know if he knows anything about what he has but it's a cool survivor.
The only things that are not original are the seat, grips, tyres and L/H brake lever.
Apart from that it looks like whoever had it BITD set it up in Patterson team colors of blue and gold.
Check it out - looks like GT bars, possibly a GT or Patty seat post, original DC MX brakes, DX pedals, Brute stem...
With a proper seat and grips this would be awesome.