Important English silver verge pendant watch with calendar Circa 1670

Silver pair cased pendant watch by Henry Crumpe
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An important, early English silver pair cased verge pendant watch with calendar, circa 1670. Very early verge movement, gut string, very early and rare pierced pillars, pierced verge wheel, very early two-edged balance without hairspring, foliot, extremely rare moving calendar on a rotating blued steel ring. Dial with heart-shaped silver cartouches and Roman hours, peripheral date display with Arabic numerals and a single hand. The outer case lacquered and decorated with nails, plain inner case, master’s mark TF. Movement signed.
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Diameter: 51 mm
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Weight: 96 g
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Signed: Henry Crumpe London