Vintage Keufel & Esser 40183 Slide Rule

Description

Vintage Keufel & Esser 40183 Slide Rule in good working condition.
Was my uncle's from the late 1940's, legible figures and symbols, functions well.  Used mostly outdoors so there are a few bits of 'dirt' along the metal edges of the runner but, IMO, with minimal impact on reading the frames or the slide. The cursor/hairline is clearly visible.
The leather case is at best in fair condition, but serviceable for storing the ruler.  The leather has hardened and, except for a small 'notch' along one edge, is entirely intact.  The canvas belt loop is intact; however the metal parts have oxidized.
Shipping via USPS 1st class mail.  Always happy to answer any questions.