Faber Castell projection slide rule 310/52 box 1960 Germany

This special slide rule comes in the original and complete cardboard box with manuals and accessories. Made by Faber Castell from Germany. This model is the 310/52 for the D-stab 52/82, a special slide rule made for use in the classroom as a teaching aid to be placed on a overhead projector or other beam / light source. It is a very high quality build with a slider and a moving cursor, all made out of separate pieces of Perspex. All parts are complete, it is working great and there are only minimal signs of use and age (some discoloration from UV-light to the separate slider). The green box is complete and in good condition as well, just some stains on top. It measures ca 38 cm x 17 cm or ca. 15  x 7 inches. Do check the attached video on how to work your vintage man tool : slide rule operation instructions!