I am going to have time to break it down and clean in soon. When I do, I will make sure to take some pictures.
The shallow engraving under the rear sight, hits the mark. It looks like the original stamp on the receiver has been filed away and etched with a newer, shallow engraving (where I got the FTR info from). The serial still matches what looks to be the original serial on the rifle, so whatever they repaired must have been something like the barrel (which looks very good for a rifle this old).