Keuffel & Esser Duplex 24” Slide Rule Set
Updated August 7, 2026
| Lot number | 430 |
| Auction | Estate Moved to Warehouse for Liquidation |
| Date | August 18, 2026 at 7:00 PM EDT |
| Auction house | Estate Auction Experts of Michigan |
| Location | Northville, Michigan |
Vintage Keuffel & Esser Co. Duplex slide rule marked “Made in U.S.A.” with multiple precision calculating scales, accompanied by its original green storage box and a brown leather carrying case personalized “JACK WAGNER.” Interior box label includes printed instructions for adjusting the K&E Duplex Slide Rule and identifies Keuffel & Esser Co., New York. The slide rule features a metal frame with white rule and cursor, and the leather case bears expected wear from age and handling. Box shows edge wear, paint loss, and scuffing consistent with long-term storage. A desirable scientific instrument for collectors of engineering, surveying, and mathematical calculating devices with excellent historical and display appeal.
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