FYI, to set the record straight about the
S-M SPORTER PISTOL. No idea where SDC got that info. The gun has been written about in American Rifleman Dope Bag, 1985 Edition Gun Digest, and numerous posts on gun forums similar to this one.
Here's the ONLY ad I've ever seen for the gun. Of the FOUR serial number groups known, I have managed to obtain three of those. They had a total production of only 600 guns, offered in 1953 only.
FLFL77