Keuffel & Esser 4012 Thacher Cylindrical Slide Rule Calculator - $250

Keuffel & Esser 4012 Thacher Cylindrical Slide Rule Calculator 1

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condition: fair

make / manufacturer: Keuffel & Esser

model name / number: 4012

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Vintage Keuffel & Esser Model 4012 Thacher Cylindrical Slide Rule. Roughly 100 years old. This slide rule has been part of a antique mall museum collection for the last decade. It is in fair condition with some missing/flaked off paper and staining on some of the scales. Additionally, a few of the bars are slightly bent. The instrument will slide and rotate freely and a majority of the markings are still visible and legible. Model number (4012), serial number (2264) and maker's mark are easily visible and can be seen in included close-up image.

post id: 7906014823

posted: 2026-01-02 09:17

updated: 2026-03-13 21:07

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Keuffel & Esser 4012 Thacher Cylindrical Slide Rule Calculator -...

Vintage Keuffel & Esser Model 4012 Thacher Cylindrical Slide Rule. Roughly 100 years old. This slide rule has been part of a antique mall museum collection for the last decade. It is in fair...