vintage Ricoh Japan No. 151 slide rule w/leather case & instruction manual

Description

Here is a full-sized (14") vintage Ricoh, Made in Japan, No. 151 slide rule with the embossed leather case and the  instruction manual. I have this listed as "Used", but the slide rule and the case are in excellent, no apologies condition. The manual (37 pages) is a little bent and dirty on the covers. I have never been able to get the hang of anything beyond multiplication and division, but if you know what you are doing, the scales on this rule should do it.