The floor plate cutting style (especially #'s 2&3 because of the heavy use of liner cuts) look alot like Wm. Gough's style of work that he did mostly on contract work after WW1.

His 'second generation' Fox A & B patterns & Colt engravings are a couple of good examples of that style.

Designed to be cut quickly (cheaply) and by apprentice & journeyman engravers he had working for him.

Maybe Sedgely was a customer too. Just a guess of course..