Dutch 22 carat gold verge in a shagreen pair case Circa 1740

Dutch gold verge watch in shagreen case
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A Dutch 22 carat gold verge pocket watch by Dirk Koster, circa 1740 gold in pair cases and gilt shagreen outer case decorated with gilt pique pins.
Full plate fire gilt movement with square baluster pillars.  Pierced and engraved cock, pierced and engraved foot and plate for the silver regulator disc.  Fusee and chain with worm and wheel barrel setup between the plates. Plain three arm gilt balance, blue steel spiral hairspring.  White enamel dial with Roman and Arabic numerals, beetle and poker hands.  Gold smooth pair cases, plain inner with gold pendant and bow, Amsterdam sign xxx inside the first case.
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Diameter: 55
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Weight: 141
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Signed: Dirk Koster
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Coster (Koster), Dirk, work circa 1742 Amsterdam.
Workplace in the Vijzelstraat (Bredius).
First and second case with small dents.
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Reference 0020000