Kueffel & Esser Co. Vintage Log Log Duplex Decitrig Slide Rule Model 4081-3

Vintage K+E Model 4081-3 slide rule. Measures 12 and 1/2" in length by approx 1 and 3/4" wide. Two sided slide rule made from wood coated with white celluloid and held together with metal end pieces. Features a number of scales as shown in the pictures. This model was in production from the late 1930s to the early 1960s. This model is also on display at the Smithsonian and the National Museum of American History. Comes with the original leather case with the owners initials. Some minor discoloration from age on the slide rule, and wear on the leather case. In excellent working condition. Overall in great vintage condition.