I had just picked up this Ruger Security Six 357 Mag. SS 6" and was looking for some help on age. The serial # is 160-722xx. Also what would be the value of it? I had a revolver guy, I see at our range often, look it over and we cleaned it a bit and oiled, shot great. He said the action was tight and it was barely broke in, looked great over all. He's always shooting his 44, so I figured I'd ask him. Here are a few pics of my new piece.