Keuffel and Esser 4081-3 Log Log Decitrig Duplex Slide Rule is a ten-inch mahogany duplex slide rule and is coated with white celluloid. The indicator is glass, with white plastic edges held together with metal screws. Keuffel & Esser used this arrangement of scales on this model from 1955 to 1962. The slide rule is in fair age specific condition, the clear slide is cracked on both sides, and the include leather holder is missing the cover lip. This slide rule is used, sold as a collectible, as is, as shown. Outside measures 13/32 x 12 x 2 inches approximately.