Schacht & Westerich Syst Cuntz early slide rule 1930 Germany

Made by the inventors of the ST-scales from Hamburg Germany comes this complex slide rule with additional rare Z-schales on the slider. This one is not the 1916 patented rule but has some slight variations and therefore named the “New Slide rule system Cuntz”. It is all complete and even comes in it’s original cardboard container. Everything is in good complete condition but there has been clearly some equal yellowing on the whole front and back, which is not strange considering it’s age. The container also shows this has been loved and used in the past and there are some signs of use and age all over (smallest chip over the L (top left). This rule has a wooden base and a metal cursor with glass insert. It measures 24 cm or 9 1/2 inches wide. Check the attached video on how to work your vintage man tool : slide rule operation instructions!