In 1986 he was at the Masters International Shooting Championship In Barry, IL with his trailer and grips to sell. These were the newer style with the bottom screw and one piece construction. I purchased a pair thich didn't quite fit my 686, so I took them back the next day and he had all the sanding/finishing equipment in his trailer and slightly sanded down the grips to fit perfectly. He explained to me there was no finish on the grips, and just to put a good wood wax on them every year or so.
I still have them on that same 686.