Rare German 18 carat gold verge pocket watch Circa 1710

Gold open faced pocket watch by Johann Michael Dermer
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A rare German verge pocket watch, circa 1710.
18-Carat gold, tiered, polished case with case maker’s punch mark G*S and large lateral hinge. 18-Carat gold, champlevé dial with inlaid radial Roman hours and blued Poker & Beetle” hands. Full plate movement, keywind, fire-gilt, signed, applied florally engraved and pierced ornaments, chain/fusee, Egyptian movement pillars, three-arm steel balance, fine florally engraved, and pierced balance cock with mascaron.
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Diameter: 51 mm
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Weight: 132 g
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Signed: Johann Michael Dermer, Ochsenhausen / London
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Johann Michael Dermer, German watchmaker
Around 1750 Johann Michael Dermer was a watchmaker in Baden-Württemberg, district of Biberach, about 40 km south of Ulm. He exported as many watches as possible to London, perhaps he acted as a representative there. The spindle pocket watch shown is dated around 1710. Jürgen Ermert mentions in his book Precision Pendulum Clocks an astronomical grandfather clock from Dermer around 1775.