Additionally, mine only ever had 21 frets. I don't recall 81s and 82s having 22 fret necks. That might be something else rather than shaving off a 22nd fret there. Mine also has a painted headstock, the same color as the body. It looks like that yours originally had one too.
The build number on the neck falls into '83, and it definitely had 22 frets at some point. Who knows what happened in all the years that have past.
I think I might have said 8.5 pounds at some point, but I actually weighted the guitar in the beginning of this thread and it is 9.5 pounds.
I still play the guitar daily and don't see me ever parting with it.
As soon as can figure out to get the posted picture to not display so huge. I included a photo in my last post, but it was gigantic so I edited it out.