|This is one of the inexpensive school
slide rules that Faber-Castell made in years before WWII. It is one of
the more complex ones.
Interesting to see that the reverse C/D scale is
named "K" instead of teh usual "CI".
On the back of the box is a label of the shop that
sold the slide rule: L. Morsbach Bürobedarf-Geschenkartikel, Linkgasse
5, Solingen. The price was then 10.75 Deutschmark.