What is the stamping on the right side of the receiver?
As you may already know, the grips on it are "Franzite" -- a fairly popular aftermarket grip maker from pre-WWII into the 1960s. You might want to keep an eye out for a set of proper original grips, if you wanted to make it more original.
I also see that the safety/hammer pin (they are one and the same) is missing its set-screw that should be threaded in on the right side. If you shot the gun without that set-screw, there is the potential that the safety/hammer pin could drift out. Replacement set-screws are available.