Simi Malmö 154/47 Darmstadt slide rule case 1950 Sweden

Interesting Swedish slide rule produced by SIMI from Malmö in Sweden. Made in the 1950’s with number 154/47, system Darmstadt. It has 10 scales on the visible 3 sides and as well as a cm scale. On the back of the slider there are 3 more scales. Swedish text on the back side. It comes in the original red cardboard box, also Simi branded with some tape to keep it together. It has an interesting cursor  with hairlines on 3 sides as well (the spring is a bad replacement or at least bent wrong but working). It measures is 30 cm or 12 inches long. The piece is in overall good condition with some signs of use and age. Do check the video below from youtube on slide rule operation.