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Vintage Otis King Model K Cylindrical Slide Rule Calculator, complete with its original storage box.
An ingenious British-made mechanical calculating instrument used by engineers, surveyors, mathematicians and scientists before the advent of electronic calculators. The cylindrical slide rule design offers a much greater scale length than traditional slide rules while remaining compact enough to fit in a pocket.
Features:
* Genuine Otis King Model K
* Scale No. 423
* Serial No. Y0196
* Made in England
* Original storage box included
* Decimal conversion chart fitted inside the box lid
The calculator extends and retracts smoothly.
Condition is very good vintage overall. The chrome finish presents well, the printed scales remain clear and legible, and the original box is included but shows age-related wear, scuffs and rubbing to the edges from storage over the years.
A superb addition for collectors of slide rules, scientific instruments, engineering memorabilia or vintage calculating devices.
