Well, I have been aggressively pursuing leads as to the engraver of this revolver. Bottom line is that there is a consensus among a half a dozen or so experts tha it is well done, in the style of Japanese-American engraver "OGAWA". It is similar to Bill Mains and Jim Eyester's dad, neither of which engraved it. More likely that Ogawa did it while still in Japan for a US serviceman in the early 60's. But again, it is still according to the experts well done. If I hear anymore, I will update the post.
Dave