Thank You, I appreciate the help guys. Okay, it's an M&P Lightweight (Model 12-2) 2".
I've got good news & bad news, depending on your point-of-view. Bad news - I won't be buying a new set of grips. Good news - I don't need them. I FOUND the originals neatly stored in a Hogue Monogrip box that was apparently installed when my Dad owned the revolver.
I don't think he ever carried or shot it, just kept it holstered in a bedside drawer. Condition is excellent (+90%), no drag-ring around the cylinder, only finish blem is a small nick on the backstrap. Now that I've found the original S&W grips...I have a nice, semi-unique, original S&W snubbie in great shape! I've got plenty of other carry options so this one will likely be tucked away for an eventual gift to my college-attending son.
Thanks Again!