Interesting ratchets. I think one could build a very large collection of just Plomb / Proto related ratchets. Just to name a few. Plomb, Proto, Penens, P&C, Firestone, M. Wards, Craftsman, Fleet, Challenger, Miller Falls, Hoppe, Tru Test and the unmarked ones. All made by Plomb or Proto at one time. Urrea in Mexico started out as a spin off of Proto. I believe was called Protomex. i have several odd ratchet parts like a 3/8 drive Proto side plate that is roll marked on both sides. A 1/2 inch drive Proto side plate that came in a repair kit that is drilled, but not tapped. Then you have all the imported knockoffs. Armstrong had a ratchet that appears to have been made by Proto with a detent ball added to prevent accidental direction changes.
EvilDr235