Based on the style of engraving, I believe your 66-1 is one of the contract-engraved guns that was sent to Italy for engraving. Other than possibly telling you that, I doubt if a specific engraver can be identified.
S&W contracted out some of their engraving beginning in the mid-70s in order to keep up with demand and minimize cost.
Bill
The two engraved 57s 4" guns I have were both made in 1980. The patterns are the same but not exactly so... Have only seen a about a half dozen engraved 57s and all of them were made in 1980...
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...as an aside...does anyone know what the time is on receiving a S&W Letter? Sent mine in at least a month ago and have heard nothing...
Bob