Check the listing for details. Hamann Manus Model R Calculator Cleaned Serviced. Condition: Used, Made in Sweden. Listed at 167.34 USD. Up for sale is a magnificent Hamann Manus R mechanical hand crank calculator, manufactured in Germany by De Te We (Deutsche Telefonwerke und Kabelindustrie AG) between 1953 and 1959. • Retro-Military Aesthetic: The metal case features a textured army green/olive green color, very characteristic of post-war production and highly sought after. The "Imported from Germany" marking is visible on the back of the hood (see photo), adding to its history. • Authentic Details: The entry levers are clear and functional, with the color markings (red and white/cream) well preserved. The rubber covering of the feet is in excellent condition. • Transfer: Featuring a one-finger transfer mechanism, allowing the result of one calculation to be used as input for the next (useful for successive multiplicatio.