Nice job, Curt.
I recognize the photo taped up to the backdrop that I assume you used as a guide for shooting the FG -- my 1967 1998 (or 345S for the purists).
You can see in the control cavity photo the "EXP-F" written (by Jill) in pencil, and also "EXP" in red marker.
I assume "EXP" stands for export and "F" stands for f-hole. In my experience "345" is found in the control cavities of both 335 and 345 models. The middle PU was added or not after the finish work was done. As there is no hole drilled in the body for insertion of the middle PU, I assume yours was a 1997 or 335.
Paul W. mentioned the colored magic marker marks. I have seen those in 1964 to 1966 semi-hollowbodied Ricks, but not after. My 1967 doesn't have them. So maybe that's a date clue if you don't have anything else to go on.
Do you have the hardware to put it back to stock?
Good luck!