Silver German key wind cylinder pocket watch Circa 1800

Silver cylinder pocket watch
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A south German silver pocket watch with cylinder escapement and date in immaculate condition, circa 1800. Gilt full plate movement with unusual set up for regulator, plain 5 arm flat rimmed balance, plain baluster pillars, cylinder escapement. White enamel dial, black Arabic numerals, black outer minute track, inner calendar markers, winding aperture at 2, gilt stylised hands and further calendar hand. Polished open faced consular case. Case stamped ‘CFR’. Movement signed.
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Diameter: 53 mm
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Weight: 112 g
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Signed: Hahn Hofmechanicus Stuttgart
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Christoph Matthaeus Hahn was born on April 15, 1767 in Onstmettingen in the region of Stuttgart. He was the son of Philipp Matthaeus Hahn and worked in his father’s workshop at first and then together with his brother Christian Gottfried Hahn. Together the brothers were “Hofmechanici” (makers to the court) in Stuttgart. 
Christoph is best known for his calculating machines which he made together with his father and later, after his father’s death, on his own. The Hahn’s calculating machines are considered the predecessors of the modern computers and the name Hahn is found in every book about the history of computers. 
Besides making early computers, Christoph (as well as his father) produced a few calendar clocks and watches. Only a few are known to have survived; one in The British Museum and one in the museum of La Chaux-de-Fonds. Another was owned by the former Time Museum in Rockford, USA. In 1790 Christoph was awarded the title of Court Mechanician in Stuttgart. He died in Stuttgart on June 1, 1833. After his death, August Bacher took over Christoph Hahn’s workshop.