German silver open faced fine pocket chronometer Circa 1820

Silver Glashütte masterpiece
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A German museum quality silver open faced pocket chronometer made by Friedrich Gutkaes in Dresden, circa 1820. The glazed 2/3 plate movement has a spring detent escapement according to Earnshaw, chain and fusee, three arm bimetallic chronometer balance with three weights and three platinum screws, and a helical balance spring. The white enamel regulator dial features eccentric hours at 12 o’clock, subsidiary seconds at 6, outer minute divisions with Arabic quarter hour numerals and blued hands. The movement is signed and numbered.
A smooth case.
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Diameter: 66 mm
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Weight: 184 g
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Signed: Fr. Gutkaes Dresden
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An important historical German masterwork 
The regulator dial in the large silver case makes this timepiece a pleasure to look at. It is not only a visual highlight for friends of 19th century German watchmaking, but also a fascinating creation by Friedrich Gutkaes (father-in-law of Ferdinand Adolph Lange), which makes it an important example of the horological industry in Glashütte.
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This watch has been described and illustrated in many works on the history of Glashütte or the development of the chronometer, such as “Glashütte and it’s Timepieces” by Kurt Herkner, “A. Lange & Söhne – Great Timepieces from Saxony” by Reinhard Meis or “Marine and Pocket Chronometers” by Hans von Bertele.
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On page 39 of volume 4 of his series on precision pendulum clocks in Germany, Jürgen Ermert writes that this chronometer was probably sold to the astronomer Anton Jungnitz (1764-1831) in 1824. Jungnitz was the founder of the Observatory in Wroclaw (Breslau), Poland.