I think the name was Teft. He worked in combination with Kimball. Here in NE we call them the Kimball-Teft fakes. I don't think this is one of them because Teft was a skilled engraver and all his "signatures" look alike. When I see something like this I usually look at the 1st edition of Gardner, the source for many of the names. Unfortunately, this one isn't in there but I still suspect its the product of a copy-cat "gun improver" of the 20s or 30s.
The real limiting factor with lock markings is that the plates were surface hardened when they were new. They had to be marked before they were hardened, which effectively means they had to be marked in England. This marking is much too crude for that. Sometimes the hard layer was so thin it wore away but I suspect the "Teft-types" simply annealed the lockplates before they marked them. They weren't interested in how the lock worked... just how it looked.
I suspect this is, as Feltwad has suggested, a fairly late, cheap B'ham export gun, possibly made with a left over commercial Land Pattern style lock... improved for sale here quite a few years ago. At this remove, guns like this can be coming out of an "old estate"... "belonged to my great-grandfather"...etc. and still be questionable.