Original Odhner Model 7

W.T.Odhner's "Arithmometers" were built in St. Petersburg in Russia from 1874, and under licence in Germany (as the Brunsviga) from 1892. The name "Original-Odhner" was first used in about 1907. After the Russian revolution in 1917 Original-Odhner was re-established in Göteborg (Gothenburg) in Sweden. The new firm built a very successful range of pinwheel calculators which adhered closely to the traditional design. Production of Odhner-style machines also continued in Soviet Russia under various state-run enterprises.