This model is in pristine condition with no blemishes and in the original factory box. 

From the ‘60s to mid- ‘80s, the .357 magnum revolver was the sidearm of choice for law enforcement and security officers. Bill Ruger ever produced the Security Six series 1972-1988. Bill saw an opportunity and wanted a piece of the action from this large market.

Basically, the same size as Smith & Wesson's K frame, the security series was stronger, due to its one-piece, investment-cast frame, making it impossible to shoot loose. Proving this point, Ruger salesmen were known for throwing the guns the length of the range, against brick/concrete walls, and then shooting them. Some even ran over the guns with trucks, proving the toughness of the new double-action revolver

https://www.armslist.com/posts/15457064/las-vegas-nevada-handguns-for-sale--ruger-security-six--357-mag