German gold quater repeater lever pocket watch Circa 1850

Gold open faced pocket watch
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A gentleman’s small quarter repeating pocket watch, circa 1850.
An 18 carat gold case, enamel dial, roman numerals, bridge movement, two hammers / two gongs, side lever escapement, screw compensation balance. 
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Diameter: 43 mm
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Weight: 51 g
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Signed:  Josef Biergans  Munchen
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Josef Biergans was the purveyor for pocket watches to the court of King Ludwig II.