This S&W is a bit more rare than the ones Karl has been taking pictures of. It’s not a rare model or variant though. It’s history makes it something rare in private ownership.
This one was used in a self defense shooting to kill a man.
My friend owns this gun. It was his father’s who was in law enforcement and in the early 1980s, this one was used by a fellow in Kermit, WV to kill a guy who was involved in an armed robbery. After it was all over, the original owner gave it to my friend’s Dad to keep.