146F 40 2 82N Duplex Faber-Castell 2/82N Duplex Slide Rule. Plastic with anodized metal end braces. No.2  of the Faber-Castell slide rule fleet. A very powerful and popular slide rule. All scales have over-length extensions. All scales are self documented at right end. . Rule, hinged display case, and manual are in excellent condition, coming with instructions