Otis king calculator B series

Inside the box is the calculator itself in a tan leather case and 3 different pamphlets, one being a 12 side stapled instruction manual and 2 different ones labeled "indispensable to every professional and business man" The address is Holborn Viaduct The calculator has the 414 423 scale in black with the Holborn Viaduct address, Made in England and a test design on the top with serial number B1438 on the base indicating an early B series circa 1925.

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