This vintage Lufkin tools Time Saver Wheel Chart Decimal Equivalent is a great addition to any collection or for practical use. Produced in 1935, this chart is made of thin cardstock material and has a diameter of approximately 3-1/4". It features screw thread information for the decimal equivalent and can be a valuable tool for machining. The chart is a product of the United States and has not been modified. It bears the copyright of 1935 and is a unique item for collectors. The brand is Lufkin, a well-known name in the machining industry. This item is categorized under Collectibles, Tools, Hardware Locks, and Machining. Please look at pictures for more details. We will package securely and ship promptly.