Fantastic Brunsviga Nova 13 ZG Calculating Machine, 1930 in Perfect Functional Condition. The shiny black metal casing has use stains and popped enamel in some areas, attesting that this is an authentic Brunsviga machine. The machine has been overhauled, and is in perfect working order, so you can use it from day one if desired. The numbers in white enamel distributed in an orderly manner on the front of the piece, appear blurred in some areas due to the use of the piece during the first half of the twentieth century. Crank or molinete mechanism with several cranks on the right side of the device. Attached in the upper right area one the star logo used from 1920 onwards over the white lacquered BRUNSVIGA lettering. In the lower part appears in white letters the model: NOVA 13 ZG, in addition to the serial number: 135870. We find both in white lacquer on the front, as well as in a black plate on the back, the name of the distributor. It is overhauled and in perfect working order. This type of machines are objects for science lovers. They have their origin in the 17th century, when the first adding machines were built, characterized by using a gear-based operation, which arose to alleviate the work activity of those people dedicated to accounting work. This type of machines were already much admired at the time, based on a system devised by Willigodt Odhner, the variant of the one developed by Leibniz in the 18th century. The German engineer Franz Trinks was the technical director of the Grimme, Natalis & Co factory in Brunswick (Germany). In 1892 he was granted a patent for the well-known Odhner machines to be marketed in Germany, Belgium and Switzerland under the brand name Brunsviga. In a short period of time, more than 500 machines were sold, mainly due to their reliability and low price. More than 500,000 machines were manufactured in various models. Without a doubt, the Brunsviga brand became the leader in the sale of calculating machines in Germany, without stopping production even during the two world wars. In the post-war period, industrial design was applied to these machines for the first time, developing technologically advanced models at high prices. In 1957 the Olympia factory of calculating machines bought 35% of the shares of the Brunsviga company, finally acquiring all of them in 1958. The Nova Brunsviga 13 model, started to be manufactured around 1920. It was a small machine that would be progressively improved. Machines of the Brunsviga brand would be manufactured until 1964, when the entry into the market of electronic machines definitively put an end to this prosperous factory. Genuine Brunsviga calculating machine!