2x Reiss Progress 3223 Darmstadt 3204 metal slide rule pouch 1950 DDR Germany

These full metal duplex slide rule comes in their original vinyl pouch, they are made by Reiss from Eastern Germany after the Second World War when Eastern Europe restarted production the communist way. One model is the Progress 3223. It has 14 scales on both sides. The other is their Darmstadt 3204 model with scales on both sides as well. The rules are completely made of metal, but the cursor is made of plastic which has several long and short hairlines on both sides. Cursers and slide rules are complete and everything is in good condition. they measures ca. 33 cm or ca. 13  inches. Do check the attached video on how to work your vintage man tool : slide rule operation instructions!