Faber Castell 4/22 Disponent 57 cm 23″ slide rule 1950 Germany

This is the extra long 4/22 Disponent slide rule by Faber-Castell in amazing condition. It has beens made extra long in order to make accurate calculations, the basic version is the 1/22 Disponent. It comes in the original cardboard case that is also marked 4/22 and again on the top. On the back it is marked for the year but this is very hard to read so I am guesstimating 1950. Everything about the rule is complete, no cracks, chips or dings and in working condition with hardly any signs of use and age. 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!