English silver one-handed pocket watch with alarm Circa 1690

Silver pair-cased pocket watch by Robert Williamson
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An early English single-handed pocket watch with alarm, circa 1690.
Early verge movement with tulip pillars, beautifully skeletonized barrel and signed plate. Champlevé dial with Roman radial hours, an alarm disc with Arabic numerals, and one blue steel hand. Silver pierced pair case with bell.
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Diameter: 54 mm
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Weight: 148 g
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Signed: Robert Williamson London
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Robert Williamson worked in London from 1658 to ca. 1714.