This is a vintage Diamond crescent wrench manufactured somewhere between 1927 and 1940. The labeling of horse shoe [2 words] rather then horseshoe [ 1 word ] depicts that it is a very early model. Also the partial ridge on the edge of handle and the non reinforced hanging ring on end also shows it's age. Diamond company started reinforcing the hanging hole in the early 1940's. Look over my pictures real good and you will see that they did use as a hammer a few times in it's lifetime. There is also a picture of the website to research it's age. It weighs 6.5 pounds. It will open up to 2 3/8 inches.