De Colección Otis King's Patente Cilindro Calculadora Regla Deslizante Modelo L y Caja Carbic Años 60
Marked to scales as PATENT NO 183723, OTIS KING'S POCKET CALCULATOR SCALE NO. 430 & SCALE NO. 429, serial no. An Otis King cylindrical calculator (Model L) with box and instructions.