Sun Hemmi 257 Chemical Engineer Slide rule case Japan 1960

This complex slide rule was well guarded by it’s original container, made in Japan by Sun Hemmi. This model is the 257 with the number on the rule and on the back of the original Leather case. It is also known as the “Chemical Engineer” slide rule. It has scales on both sides and a heavy duty cursor with multiple hairlines. Slide rule and curser are complete and everything is in good condition with some small signs of use and age only. The quality leather container is complete and signed Hemmi, still protecting the slide rule well. It measures ca. 32 cm or 12 1/2 inches. Check out the attached video on how to operate a vintage slide rule!