On the surface these appear as just your basic common low backs.
Each have an "S" stamped behind the serial number.
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I just thought is was kinda neat having both the fixed and adjustable site Security Six's.
A lady at Ruger told me that guns returned to them from gun writers or others who got to "sample" them were frequently stamped with the "S". Neither of these were recorded other than "returned, checked for function, stamped "S" and sold.
I know it's a needle in a haystack, but...
In 1974, I bought a Fixed Sight Security Six. I sold it to a friend some years later, and it was subsequently stolen. When he reported it, he did not know the s/n, so there was no further follow up by the police.
If this revolver ended up in somebody's collection, I'd sure like to buy it.
s/n 150-74727 S
Thanks.
WAYNO.