This slide is the extra long version (55 cm or 22 inch) desk version. It is the most expensive version of the Darmstadt available from Aristo in 1968 (2FE2-code). The slide rule is completely made of plastic with plastic cursor as well. Overall in very good, hardly used condition. It comes complete in the original case (with decal), with manual in German and with the 1364 sheet (not shown in pictures). Check the attached video on how to work your vintage man tool: slide rule operation instructions!
