Antique Brunsviga MR Mechanical Calculator. Germany, 1920s

Rare antique Brunsviga MR mechanical calculator made in Germany in the 1920s, in fine condition and excellent working order. The MR Brunsivga model is very rare only 3433 units were produced from 1921 to 1924, and only a few have survived to our days. This calculator is one of those rare pieces. In this model, the bottom carriage is separated in two parts and just the right half moves. The revolution meter remains in its place. The machine mounts a black-enameled metal casing in fine condition, with engraved digits and inscriptions painted in white. We can see the brand name, the logo and the serial number Nº 46835. At the bottom left side we see the company name, GRIMME, NATALIS & CO., in golden lettering, while at the back the calculator bears the Brunsviga name printed in gold too. The base and the case are made of light-colored mahogany wood and preserve the original finish, shiny and warm. The case preserves the metal handle and the lock and key in working order too. For its rare quality and excellent condition, this antique mechanical calculator Brunsviga MR deserves a honor place in any bookshelf or study. Dimensions: Bases Width: 14.57 in / 37 cm. Depth: 7 in /18 cm. Calculators Width: 11.8 in / 30 cm. Height: 3.74 in / 9.5 cm.Brunsviga Calculators - History The history of the Brunsviga calculators starts in 1892, when Grimme, Natalis & Co., a factory where sewing machines were manufactured, begins to produce them after the engineer Franz Trinsk bought the Odhner arithmometers patent. From 1892 to 1957 different models were produced. The most remarkable and popular ones were model B (1893-1927), model M (a smaller version of the latter), the Trinks Arithmotype (1910, first and only Odhner-type calculator which could print the outcomes) and the Trinks-Triplex (1911). The word Brunsviga is the Latin name of Braunchsweig, the city where the factory was located. During all its existence, the company made and sold nearly 500.000 units. In 1959 the factory was taken over by the Olympia Werke, a typewriting company. At the late 1960s production came to an end. The Trinks-Brunsviga calculators work with the pinwheel system developed by W.T. Odhner in the 1870s. It was inspired in turn by the arithmometer designed by Leibniz in the 16th century.