This Otis King calculator, often called a cylindrical slide rule, was marketed by Carbic Ltd. of London, England. It has scales 429 and 430, the serial number is Y0808, and it comes complete with its original box, 8 page instruction manual and leather case. All items are in very good or better condition.
Otis King's Calculator shown extended
Collapsed calculator with instructions, box and leather case
End of calculator, showing serial number
This item was offered for sale/trade. It is no longer available.
Page updated December 20, 2020