Vintage Hyde Optical Slide Rule pocket calculator. Manufactured around 1939 by the P.A.S. Company (New York) for distributor Henry Herbert, specifically for photographers.

Slide Rule: In good, functional vintage condition. The stainless steel body shows minor, typical light surface scratching from the rule sliding back and forth over the years.

Lettering: The etched markings remain legible, though there is some light vintage wear to the outer edge lettering as shown in the photos.

Case: Includes the highly desirable original brown leather slipcase. The stitching is intact, showing honest cosmetic wear and patina consistent with age.

Note: Does not include the original paper manual.