Charlie, There a guy named Findley who lived in Stone Mountain, GA who faked all the SA and Winchester cartouches
for M1rifles for years (he has since died but you can bet his stamps are still around) The late Mel Bishop also known
for stamping SA and Winchester cartouches, collectors soon recognised his lazy R in the Bishop WRA stamps. Also
there is the Rahway, NJ SA SPG that collectors know too. These counterfeiters make errors and guys like Rick borecky
study these cartouches but alot of good money was spent on fakes and stocks ruined and it is still going on.