I think the shine is blinding me for I can't see any modification unless your talking about the grips. The grip safety is longer but I think that is the correct contour on an Ithaca. Cool that he gave it to you. That's a good friend. Of course it could be said that you're a good friend too for helping him through his nasty divorce and helping him move.
Yeah, I like all that old stuff you mention. Here's a heartbreaker. I had a crackerjack M1D that I ordered from the CMP. I later traded it to a guy for an 1893-S Morgan silver dollar. Sold the coin for a nice profit but don't have either now. I really like keeping stuff rather than selling it off. Oh well, can't keep everything.