Check the listing for details. Vintage Monkey Wrench – 9” AUTO – U.S.A. – Adjustable – Early American Tool. Condition: Used, Made in United States. Listed at 7.00 USD. Vintage Monkey Wrench – 9” AUTO – Made in U.S.A. – Adjustable – Early American Tool Vintage adjustable monkey wrench marked “9 AUTO” on the handle and “MADE IN U.S.A.” on the opposite side. Features a classic straight-handle design with solid steel construction. A well-made early American hand tool suitable for collection, display, or light use. Marking: “9 AUTO” Country of Manufacture: United States Logo: Small stamped logo on reverse The “AUTO” marking is a size/model designation, not a company name. Many U.S. tool manufacturers used this style of marking in the early 20th century. The exact maker is unknown, but the wrench is clearly American-made and from a quality industrial manufacturer. Estimated era: Early to mid-1900s (circa 1910s–1930s) Overall length: approx. 9 inches Width at head: approx.