686-1.....Serial is AUY1649.....
It's kind of a hair spiting thing, but it wasn't really a "defect". The gun worked fine. There was just one certain brand of primers, that were too soft. With really hot loads, the primers would flow back into the firing pin hole and prevent the cylinder from rotating.
That's what the the recall addressed. The hole was actual in a pressed in bushing, so S&W installed a new bushing with a smaller hole. That then necessitated the need for a smaller firing pin - which in those days was on the hammer and held in place with a rivet.
The defect, if you ask me, was with the primer manufacturer. (S&W remained incapable of fault... until the Lock Hole. The lock proves the Protestant theory of "original sin"


).
That out of the way...... you got an awesome gun there. The original stocks would of been wood Targets. It looks like a LEO gun. Lots of little scratches that don't effect anything. You can tell that gun use to work for a living.
Did you know it has a
trigger over-travel stop? That little off-center flat piece of metal behind the trigger. To adjust it you take the side plate off. You'll see a tiny screw head that can be adjusted to cam the stop in and out.
The stop is not a rare thing. When you look for them you'll see them all the time. A lot of the early L-frames had them. Often, when the gun was in LEO service the stops were removed as a matter of routine by police armorers. It was thought that this would improve reliability.