It's pretty dang good detective work from where I'm at.
thx, I tried to find the games but the only one I could find was the 85' regular season game; I was hoping to find the play in the photo but there was no #34 on the team. I still fast forwarded through the whole thing in the off chance something slipped through the craps but no luck
on first pass, there were only 2 games between Seattle and the Niners so I was hoping I could simply track them both down and then problem solved but then I realized the stat website I was looking at didn't list pre-season games so I went back to Wikipedia and discovered they played each other every damn pre-season game.
The 09-25-1988 game that had #34 playing for Seattle seems the likely game since
the temp appeared to be around 60 degrees that day which is probably cold enough for wearing a jacket, etc. If you can track that game down, you might at least confirm who the RB was for sure but that still wont solve the mystery of the signature.
The other cold game was 1985 regular season Week 12 (11/25/85) and thats what I watched so that doesnt leave many other options for games that had Fuller and a #34 playing RB for Seattle (unless I overlooked a player for Seattle that was #34 but not a RB)