Loga 30 RC circular slide rule case 1950 Switzerland

This high quality metal double sided circular slide rule was produced by Loga from Switzerland. This model RC comes with the original brown leather sleeve that has kept it in good condition so there are minimal signs of use or age but the seam besides the zipper is torn. It is fully functioning with a interesting cursor set-ups. The diameter of the slide rule is 12,5 cm or 5 inches. There is the smallest crack in the cursor besides the centre (will not crack further under normal use). Check the attached video on how to work your vintage man tool: circular slide rule operation instructions!