I am certainly no expert on engravers but I was going through some Gun Digest magazines from 61 through 76 and I agree with Terry, it looks alot like Griebels' emgraving. But it also looks alot like Paul Jaegers work or The Pachmayer Gun Works work. I hope you can find out who the engraver was. It would be nice to know that information. It's too bad so many great engravers rarely signed their work.