Otis King cylindrical Slide rule model L full set 1950 England

This is the Otis King model L with serial number P2065 guesstimating 1950’s. A great piece of calculator history. It comes in a full set with matching numbers original box and manual (with wear holes in the first pages). The cylindrical shape allows for 2 very long scales (scales are 165cm or 66 inch) which gives the user a high accuracy for only the basic calculations (multiplication and division). Slide rule is complete with some wear to the top only where it touches the box inside. It measures ca. 16 cm or 6 1/4 inches long when closed. Check out the attached video on how to operate a vintage slide rule!