Diwa 851-4 Darmstadt pocket slide rule pouch 1960 Denmark

This duplex pocket slide rule must have the most screws I have ever seen in 1960’s pocket version. I found 8 in the cursor alone and 2 in the black end parts making 10 in total! This is quite a rare rule by the small European maker from Denmark, DIWA. This model is the Darmstadt 851/4 with scales K,A,B,CI,C,D  on front and L, S, LL1-3, D and T on the back. Curser and window are complete and everything is in good complete condition with metal ends to hold the screws. There are signs of age on the items but only from normal use. The leather pouch is also signed Diwa and has protected the rule nicely over the years which shows in the wear on the leather. It measures 17 cm or 6 3/4 inches. Check the attached video on how to work your vintage man tool : slide rule operation instructions!