It has taken me many years to figure out that a lot of what I took to be true about 19th century gunmaking, because I read it somewhere, was not.

While I suppose individual London and Birmingham engravers might have stylistic preferences or particular aptitudes, the intertwined nature of the London and Birmingham trade and its use of outworkers would blur any geographical origins.

What I have noticed is an evolution in engraving patterns through the late 1850s and 1860s, and that's as far as I'll go.