A Curta Type I mechanical Calculating Machine by Contina AG Ltd, Vaduz, Liechtenstein Mid 20th Century, in dust and shock proof carrying case, with instruction manual and computing examples booklet, calculator 11cm high, in case 12cm high Note: The Curta calculating machine was developed by Curt Herzstark as a successor to the design of Gottfried Leibniz's Stepped Reckoner and Charles Thomas's Arithmomete, but innovating with an extremely compact hand-held design. The manual accompanying this model has a publishing date of 1962. Condition Report: Outer case with some scuffs and general wear, causing some loss of colour. Heavier wear with some scratches to base. The calculator has some light cosmetic wear to the top carriage and the grip on the base and also to operating handle consistent with light natural use. Setting knobs move up and down through 0 to 9. The carriage lifts and rotates from 1 to 6. The operating handle rotates and makes the numbers change on the indicating dial and also on the answering dial. The handle can be lifted up and pushed down into its upper and lower positions. The clearing lever moves and locks in place. Please note Rosebery's do not guarantee the working condition of the mechanical elements, duration and accuracy of the calculator offered for sale.