Faber Castell 4/87 Rietz 57 cm 23″ slide rule 1950 Germany

This is a extra long slide rule by Faber-Castell. It has not one but two cursors, which are identical but one has room for a magnifier. It also comes with a manual (repaired and last page missing). It has beens made extra long in order to make accurate calculations. It comes in the FC green cardboard case that is still complete with only some signs of storage / use. Everything is complete, no cracks, chips or dings and in working condition with only small signs of use and age, mostly  some discoloration to the front where the insides are more white. This rule has a wooden base with 6 screws on the bottom for tightening. It measures 57,5 cm or 23 inches wide. Check the attached video on how to work your vintage man tool : slide rule operation instructions!