I'm analyzing ceramics from a historic site in Phoenix. I've checked Godden 1964
and Kovel & Kovel 1986 and haven't found this particular mark:
MADDOCK & GATER. * STAFFORDSHIRE POTTERIES *
These are in a circle around the typical lion/crown/unicorn/crest mark. The plai
n plate is from a feature that probably dates from 1885-1905.
I'll probably be asking about other marks later!