Addiator Duplex - Calculator - 1920-1930

The Addiator Duplex is a fascinating relic from the era of mechanical calculation and a genuine highlight for any collection of technical antiques. This two-sided model was masterfully crafted to perform additions and subtractions purely mechanically and completely without power. While one side enables precise additions, the back is specially designed for subtraction, making the device a versatile tool for engineers and merchants of past decades.

The compact metal housing impresses with its timeless typography and high-quality German manufacturing. Operation is traditional via a metal stylus, with which the racks are moved precisely, while the characteristic zero-setting yoke at the top edge resets all displays with one hand motion. The mechanism continues to operate reliably even after many years and offers a tactile experience that modern pocket calculators completely lack. With its authentic patina, this Addiator is not only a functional curiosity but also a stylish decorative object for the office or the display case. It embodies the analog precision of a bygone era and is a special find for enthusiasts of historical calculating machines.