WOW! Lot's of info to take in. First off, this pistol has the BEST TRIGGER EVER!! Lightest pull on any pistol I've ever tried. Haven't shot it yet, but I have great expectations.
As far as the grips go, I have a box full of those exact grips I got from a friend's wife after he passed. I should be able to find one that fits. I took off rubber grip and did find a bit more rust, but should clean up. There is an S prefix to the Serial Number (S 993666) on barrel flat, bottom of grip frame, back of cylinder and on yoke.
Inside yoke/frame number is 72057 with a big "3" stamped just over the number on the frame.