Crescent/Crestoloy and Diamond Caulk made these up until the '60's. All are imperial sized. The wrenches come in 4 sizes, 4/6 inch, 6/8 inch, 8/10 inch and 10/12 inch. They are considered a novelty now. They are very collectable. Good to great examples are easily sold for top dollar. There are other double ended adjustable wrench examples, but not in this style/configuration.
"It didn't hurt, flirt, blood squirt, stuffed shirt, hang me on a tree
After I count down three rounds, in Hell I'll be in good company" - The Dead South