That SN probably shipped in 1917. The obliterated SN makes it a FEDERALLY illegal gun. You can go to BATFE, to see if anything can be done, but more than likely it will be confiscated. You can try to get them to let it be re-stamped with a new SN which they will issue, but be aware you will need to come up with a mighty good reason why the SN was obliterated.