The Vintage National Dietzgen No 1767 Single Sided Slide Rule is a collectible piece of engineering history from the United States. This slide rule, made by National Dietzgen, features a single-sided design and comes with a protective sleeve/case. With its high-quality construction and historical significance in the realm of science and medicine, this slide rule is a unique and sought-after item for collectors and enthusiasts of vintage tools. Good condition but original owner personalized see photo