I'm actually stumped. I don't recall seeing any T-handle wrench that had an end pointing off 90* like that. The steel rod in a looping T-handle usually terminates at the shank, like a bow-tie.
Walden and Blackhawk T-handles squashed the shank up against the T. Like this one is. But again, the handle completed the bow-tie of the T, if you will.
Mossberg's T-handles were more open, not squashed up against the T.
Bonney and Williams did not make early fixed handle socket wrenches.
My best guess without looking into it further would be an also-ran mfgr, or something that one of the others (but not Mossberg) made special for Firestone.
EDIT: As for age, it could be anywhere from 1905 or so to the 1920's. The advent of detached, interchangeable heavy forged socketry and handles did not immediately end the production of fixed sockets wrenches.