IMO, you have a parts gun ( a 1911 slide on a 1911-A1 frame, for starters), that looks like it's had a serial number filed/ground off & some number (SN ? I doubt it, unless it could be verified that BATF did it) restamped by God knows who.
The Model 1911 slide
The Model 1911A1 frame w/defaced SN
I realize you already posess it, but sans supporting BATF paperwork regarding the restamped SN - I would never have touched it, even with the proverbial 10' pole.
.