Faber Castell Novo Duplex 2/83N in case 1970 Germany

Large well know slide rule that was made in Germany by A.W. Faber & Castell and is called the Novo Duplex 2/83N. This one comes with box only. The slide rule and cursor are both complete and in good usable condition, easy to read but it is in clearly used condition with visible yellowing (back and front) and some fading to the blue, green and red colors. The box is complete, closes well and has no cracks, top of the box transparant part has turned darker. It measures ca. 38 cm or 15 inches long. This great rule is reinforced with metal pieces, the screws have darkened due to age. Price matches condition, please check my other slide rules if you are looking for a compete set. Check the attached video I found on YouTube (not the rule I am selling here) on how to work your vintage man tool : slide rule operation instructions!