Post some better close up photos, if possible, and maybe we can identify the engraver's style. Why do you think they are factory engraved? Vernon G. Wagoner is a WW2 vet and was a watchmaker/engraver who started engraving guns in 1955. He never worked for Smith & Wesson as a factory engraver. He is listed in the book, "American Engravers" by Roger Bleile. He was originally from Ohio but moved to AZ in 1974 and lives ( or lived ) in Mesa, AZ, if he is still alive. A factory historical letter will tell you if the guns are factory engraved. Ed.