Have you contacted John Dutcher? He probably knows who's gun that was. Some owners didn't want their info revealed, so it was left out in his book, but his notes will have it.
His contact info is at his web site:
(You need to Login or Register to view media files and links)

I, for one, would be interested to hear if the rifle and wood ever get back together.  Please, keep us posted.

This is a very interesting saga, I had that wood sitting on a shelf for about 8 years and reading about the PG configuration caught my interest. It never occurred to me to check the stock I had. I was pretty shocked to find that I had in my posession the wood from the rifle mentioned in the book. I will certainly post any progress that's made in re-uniting the wood to the gun.
For nyone who might be interested, Dave Crossno made a pattern from this stock, so if you'd like this stock in this configuration he can fix you up. His # is 405-396-8786.

Well curiosity got the best of me, so I had to go check my #3F PG to see what the number was. Marlin often built styles of guns in groups so the workers would build maybe 2-3 dozen of one style and not have to change patterns, etc.
Anyway, my Ballard #3F is 16 numbers from your buttstock! Bet everything inbetween was similar. Is your stock plain or checkered? Checkering was an option on the #3F and mine is checkered.
(You need to Login or Register to view media files and links)

I just checked the Dutcher book nd the gun illustrated on page 125 does not appear to have any checkering either.