Wow Dave what a nice (and rare) one. I really like the Magna's and assume they number to the piece. So, what I like about this gun is apparently they switched from the long action to short action shortly after yours was made. I've been trying to think of any other model S&W made that did that but none come to mind.
I'm sure that's the only k32 I've ever seen with a humpback.
You got a good'un.

Roger