Antique Slide Rule Keuffel and Esser N4043-3

This is a vintage Keuffel and Esser Slide Ruler, model N4043-3. Circa 1940s-1950s, the 10" slide rule was constructed on a mahogany wood frame with a celluloid overlay laminated surface.

The rule is in good condition with graphic darkening on reverse. The metal rimmed cursor has no chips or scratches. The black leather case is included,

Rule Details:
Made in U.S.A. by Keuffel & Esser Co., New York
Patents listed on stock: 1,934,232; on cursor:2,086,502
K&E N4053-3 Polyphase, Serial Number 725837
10in // A [ B, CI, C ] D, K || 25cm
[ S, L, T ]
Equivalents
New K&E logo on right of slide.