Chas. The art of extravigant hand engraving did not "die out" in the late 1700s. I am a fan of Guns made by the Mortimer family. H.W.Mortimer was the gunsmith to the King ( George III ) & engraved several guns for him, himself. He also used Moses Brent. Here is a pic of Brent's work done for H.W.Mortimer ca 1794
( this pic is from the back cover of "the Mortimer Gun Makers 1753-1923 by H.Lee Munson
His family ( Mortimer) was still doing heavly engraved guns into the 1840s
Puffer