German astronomical cylinder watch with calendar Circa 1800

Gold watch with stoppable dead-centre seconds by Hahn
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A fine and rare gold German single-cased astronomical cylinder watch with calendar, periods of the day, dead centre seconds, and half-second beating balance, circa 1800. This unique watch features a gilded full plate movement with a cylinder escapement, a large half-second beating five-arm flat brass balance, and a decoratively pierced and engraved circular balance bridge with a central regulation sector. It also includes a multi-faceted red endstone, with the coils of the mainspring going barrel exposed within an aperture to the backplate, and cylindrical pillars, and is signed Hahn Echterdingen.
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The dial is white enamel, with three subsidiary dials for time featuring Roman numerals and Arabic quarter-hour divisions. It also includes a date combined with months and an indication for their length, as well as periods of the day and night combined with days of the week represented by their planetary symbols. The dial is signed by Hahn à Echter Dingen. The case is made of pink gold, polished with moulded bezels, and includes a gilt metal bow.
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Diameter: 62 mm
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Signed: Hahn à Echterdingen
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The movement is operational. The dial has small nibbles and chips around the edge, but the main surface is generally in good condition. There is a solder repair to one of the hands. The case shows signs of repair around the hinge and repair at the base of the pendant. Otherwise, the case has light scuffs.
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The Hahn brothers, Christoph Matthäus (1767–1833), Johann Georg (c. 1772–c. 1813), Christian Gottfried (1769), and Immanuel (1773–1833), all worked for their father, Matthäus Hahn (1739–1799). Matthäus Hahn, a significant figure in German horology and a clergyman, was known for pioneering the use of the cylinder escapement in Germany and for his astronomical and calendar clocks. He was highly influential and had many students, including Jacob Auch. His sons Christian and Christoph became “hofmechanikus” – court mechanicians.