Early German silver rare box pocket sun dial watch Circa 1750

Silver cased sundial inscribed with various cities
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A silver case in box form, both sides inscribed with various European, mainly German cities and the corresponding geographical data, hinged, inside a very beautiful sundial and compass.
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Diameter: 43 mm
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Signed: Nicolaus Rugedas                
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The important clockmaker family Rugendas in Augsburg made finest sundials already in the 16^th century. As the signature is Rugedas, it can be assumed that this watch is a deliberate falsification of the famous name. Nevertheless, the piece is very rare and of fine quality.   
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Rugendas family
In his mention of Nicolaus Rugen in his book “Meister der Uhrmacherkunst” (masters of watchmaking), 2^nd edition, Wuppertal 2010, Juergen Abeler refers to the renowned Augsburg family Rugendas, makers of watches and compasses: Nicolaus I Rugendas, was born in Melsungen (Hesse) in 1582 and went to Augsburg in 1608; he became a master in 1616 and died in 1658. He was known to be a very capable watch and clockmaker and was also fortunate enough to marry well (1608, Sarah Schmidt). He was registered as master of the guild in 1638/39. Of his nine children, two sons Hans Jakob I and Nicolaus II (born in 1619) were also clockmakers. His son Nicolaus II Rugendas lived as clock maker in Augsburg from 1619 to 1695. His masterpiece was a table clock, which was bought by Archduke Leopold Wilhelm in 1661. Several dozen of mechanical clocks as well as sun- and moon dials by Nicolaus II remain; however, it is not completely clear whether the mechanical clocks may have been created by his father. His son Nicolaus III (1665 -1745) was also a compass- and watchmaker.