As I recall, when Purdey used to make different grades of sidelocks, guess what the difference was between their "Best" grade gun (extra finish was not offered yet) and the next grade down..... In some cases like "A" grade, yes/maybe. In lower grades, "B", "C", "D", not usually. Keep in mind that "Funeral" models (basically devoid of engraving) were priced as best work guns. Graded guns lower than being based on the shops basic best model were usually ordered from Birmingham.
......As far as I can tell from the catalog excerpts printed in Dallas book, it was the amount of engraving on the action. This gun was still made with Whitworth Bbls, on a Beesley action, and it featured ejectors. Probably and "A" grade, possibly a "B" with a lot of corners cut.
OWD
