I have several of that same style of ratchet. Some are marked PLOMB, PROTO, FLEET, PENENS, O, and some with no name. All made by The Penens Tool Corp. a company bought by Plomb in the early 1940's. Some of this style of ratchet are chrome plated, some have a cadmium finish and some a dull chrome finish. There may be some with a bare steel finish.
EvilDr235