Around here, there was a company called "Elkhart Brass". A foundry that produced hose nozzels, hydrant wrenches, & a lot of fire fighting equipment. Oddly enough, I found 1 of their wrenches when I lived in Florida. I'll have to see if I can find it to see how it compares to yours. No matter what, they're neat tools to hang on your wall. Seems like there should be a firefighter site somewhere. Everybody collects something.