English rock crystal single handed pendant watch Circa 1640

Gilt metal and rock crystal pre balance spring verge by Robert Grinkin
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A fine and very rare English gilt metal and rock crystal pre balance spring single handed verge pendant watch in the shape of a four leaf clover, circa 1640. Hinged, gilt brass full plate movement, early Egyptian pillars (one replaced), fusee with gut line for the short three wheel going train, verge escapement with two arm circular steel foliot, small florally pierced and engraved gilt brass pinned cock with a later screw, worm- and wheel set up replacing original ratchet and click. Silver silplate dial with Roman chapters, quarter hour markers, the centre engraved with flowers, gilt brass dial plate engraved with floral decoration and original blued steel tulip hand. Lobed and faceted rock crystal cover and case back, the gilt metal border engraved, the interior border and bezel engraved with scrolls and foliage, small pendant with a loose ring, turned finial. Movement signed.
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Dimensions: 44 x 29 mm
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Signed: Robert Grinkin Fleetstreet London
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Robert Grinkin was one of the most notable makers of the period, he was a founding member of the Clockmakers’ Company, to which he was elected in 1632, having previously been Master of the Blacksmiths Company in 1609. He was made Master in 1648 and died in 1660.