Graphoplex 690a Neperlog log-log slide rule complete set 1970 France

This complete set of slide rule, faux leather original marked sleeve, manual and card are made by Graphoplex from France. This model is the 690a Neperlog log-log. It has scales on both sides and 4 rubber feet on both sides as well. The rule itself is made of plastic, as well as the cursor which has several long and short hairlines on both sides. Curser and slide rule are complete and everything is in very good condition. It has a French instruction manual. The numbered sleeve is complete and in good condition as well. It measures 33,5 cm or 13 1/4 inches. Do check the attached video on how to work your vintage man tool : slide rule operation instructions!