There was no machine engraving at that time. There was stamping and roll engraving (e.g., Colt cylinders), but skilled labor was a couple of dollars a day and engraving was cheap, especially in Europe. There are some short-cuts, like the area of stippling and the rows of o's done with a punch, but most of that engraving is real hand engraving. While engraving of even moderate quality would significantly increase the value of, say, a Single Action Army Colt, I don't see it doing much for that Belgian revolver in terms of value.
Jim
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