This is a large 15-1/2" Fairmount open wrench with a No. 1039 designation, measuring 1-1/4" x 1-7/16". It is made in the United States and is a high-quality tool for mechanics and collectors alike. The brand is well-known for its durability and reliability, making it a great addition to any toolbox. This item falls under the categories of Mechanics, Tools, Tools, Hardware & Locks, and Collectibles, and is perfect for those interested in the history of tool manufacturing in the United States. It is a unique and valuable piece of equipment that will make a great addition to any collection.