Nestler 12a 12b pocket slide rule Germany 1930

This early small pocket slide rule slide rule measures 15 cm or 6 inches long, made from wood. It comes in the original card board box, signed with the number 12b while it is signed with 12a below the slider. The 12b marks it as being sold with a magnifier cursor, yet this one comes with a replaced standard cursor (looks like original Nestler and era correct also). Price is adjusted for this. The slide rule itself is in good condition with some signs of normal use and wear to the sticker on the back on one side. Do check the video below on how to work your vintage man tool : slide rule operation instructions!