Nice pair. The open end is a Ford wrench, but actually a Fordson tractor wrench. I am not a researcher with all the catalogs, others do that way better than I, but that wrench has two uses, one or the other is true. On a Fordson tractor there is no fuel gauge, the wrench is dipped in the tank, the numbers will tell you how many gallons of gas remain. Or, when plowing its customary to reset the plow to do the dead furrow, then reset to plow. If the ground is hard, or wet, one has to check the depth of plowing, here is where the wrench can be used as a ruler. Depending on the cover crop, plowing was done five to six inches deep, sometimes, more, or less. I have the same wrench, but not the box end. Good find.