On the old wrenches without markings, think generic, hardware store, 1925. Sold lots cheaper than the fancy Bonney, Williams, NB,Winchester, that came in boxes. These came in boxes, or tubs, and sat on the floor, Yep, need one of these. Falls off the tractor, not a big deal, twenty or thirty cents. But they were still better than the universal five sizes cast wrenches that came with the machinery. The guys that bought these were just transitioning from using a monkey wrench on everything. Some of the old machinery only had 3-4 different size bolts on them, mowers, rakes, corn planters, so 3 double end wrenches did it all.