An authentic monkey wrench manufactured by the people who invented it, the Coes Wrench Company, before the company merged with a sibling company, the Loring Coes & Company - the Coes brothers made two different companies that did the same thing, but they merged under LC&C in 1888, and manufactured wrenches until 1928, but they used the makers' mark on this wrench- which just reads "COES WRENCH CO., WORCESTER USA"- only until the merger, meaning this wrench was manufactured sometime between 1881-1888.