Ron, your GH (Grade 2) engraving seems very unusual. The zig-zag pattern around the border of your frame is typical of engraving seen on lower Grade 0 guns of that era. The typical GH border engraving, for lack of a better term was a wave pattern which is there on your frame bordering the engraving that radiates out from your bolsters. Also, to my eyes it looks like that zig-zag border engraving was done directly over the wave pattern which, coming from the factory would be highly unusual and probably unlikely. I've never seen this border pattern on a GH before but I haven't examined as many as others have.
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