VTG Keuffel & Esser (K&E) Polyphase Duplex Slide Rule Org Leather Case 1951 USA For Sale

VTG Keuffel & Esser (K&E) Polyphase Duplex Slide Rule Org Leather Case 1951 USAUp for offerding is an exceptional piece of mid-century American engineering history: a matching, vintage Keuffel & Esser (K&E) Polyphase Duplex slide rule set. Known for producing the highest caliber drafting and mathematical tools of the era, this K&E set is highly sought after by vintage tool and scientific instrument collectors.
What's Included:
K&E Polyphase Duplex Slide Rule: Clearly stamped "KEUFFEL & ESSER CO. N.Y." on the body. The scales are crisp and legible. The sliding mechanism operates smoothly across the majority of the scale, getting just slightly tight right at the very end of the track. Glass cursor window is fully intact.Original K&E Stamped
Leather Case: Genuine top-grain leather protective case embossed with "K & E POLYPHASE DUPLEX / REG. U.S. PAT. OFF." The heavy-duty leather, stitching, and snap are structurally solid, providing beautiful vintage character.Bonus Lawrence Instruction Book: Also includes a vintage "The Quick and Easy 'Lawrence' Slide Rule Instruction Book" which acts as a great operational reference guide for classic slide rules.Condition Notes:
This vintage item shows honest signs of age and historic use. The slide rule faces are clean with minor expected aging. The leather case has gorgeous authentic patina but remains perfectly functional with strong seams. The bonus Lawrence instruction manual shows notable wear along the right edge of the cover, including chipping, fraying, and minor paper loss (as pictured); however, all inner pages remain perfectly intact and completely legible. Please see pictures for better determination of condition.Combined Shipping: We love combining shipping to save you money! Be sure to explore our other listings for more unique finds.Thank You: Thank you so much for visiting our store and supporting our small business.(B# 16)