A distant cousin, a pilot in WWII brought home an M1icon Carbine which has been in the family since. I got interested in it recently and with the help of the Riesch book, have determined that it is an early Inland with all the original parts. The odd thing is that there is no serial number. The area is nicely machined, not hacked up as you might expect from the grinder in someones basement. The pilot died a couple of years ago, so I can't ask him if the M1 was like that when he brought it home. The entire receiver including the area that once held the serial number has that greenish cosmolineicon patina, making me wonder if the piece left the factory that way?

Any history of this happening?
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