Sorry, Radom, but you are wrong. The 1968 law required new guns to have serial numbers, but the law banning removal or alteration of existing serial numbers dates to 1938, so obliterating the serial number on that gun was not "legal at the time" no matter what "piggy faces" it was replaced with. The gun, unfortunately, is contraband and illegal to possess.
The "104" is spurious and was probably applied so the seller could claim that he thought that was the serial number and didn't know the original serial had been removed.
Jim
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