They didn't do themselves any favours by marking so many of those WW2 specimens so lightly. Considering that nobody had any trouble reading the markings on Sht L.E.s for years.
At the weekend I saw a Century Arms International import where they appeared to have given it an entirely new serial number made up out of whole cloth, done with the funny micropunching machine of theirs, as it was visibly different from what we could see of the original.