Some of the best I've seen, the engraving that is (grin).
Certainly not as finely and minutely finished as the modern Bulino experts, but I'll bet it was done by a known name.
BTW I've heard that Ol' Scratch's inletting wasn't so smooth either when viewed up-close-&-personal, when compared to some of today's smiths' work.
For a good discussion of some of the various engraving treatments, James Meek's book is good. It shows some good closeups that will really make you wonder how such a rough-looking surface can appear so smooth at a little distance.
Regards, Joe