Wondering if anyone can tell me what period of time the S&W hard plastic/rubber grip adapter was made for the J frame revolvers? I know Mershon and Pachmayr also made this, did they make them for S&W? Looking for a little background regarding these style of grip adapters. I understand the original Tyler T grips were introduced in the late 50's, just not sure if the hard plastic/rubber ones by S&W, Mershon, and Pachmayr were from the same time period. Thanks