I was looking in the 1996 Standard Catalog of Smith and Wesson. In the 41 Magnum Background Information it states, "S&W 41 Magnum revolvers include the adjustable sight Model 57 and fixed sight Model 58, along with their stainless steel counterparts, the 657 and 658." Was there a Model 658 or was that a mistake as it is not in later editions under the 41 Magnum Background Information.