Rare and early English silver pair cased date watch Circa 1660

Rare and early silver pair cased date watch
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A rare and early English Charles II silver pre balance spring, single hand watch with date indication, circa 1660. Gilt full plate fire gilt movement, early type divided Egyptian pillars, fusee and gut line, verge escapement, two arm steel balance without a spring, silver florally pierced and engraved cock secured by a screw, three wheel train, worm and wheel set-up with pierced blued steel brackets, silver plate and Arabic numerals from 1 to 8.
Case with curved band, polished, with a shutter for the winding aperture, split bezel, small swivel pendant, loose ring.
Silver chapter ring with Roman numerals, half hour markers and inner quarter hour track, inner pierced and engraved composition of spring flowers over a black ground, outer 31 day calendar ring with a pointer mounted on a gilded ring between the chapter and the calendar rings. Blued steel single tulip hand and pointer.
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Diameter: 50 mm
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Signed: Thomas Chamberlaine de Chelmesforde
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Thomas Chamberlaine He worked in Chelmsford (Essex) and London between 1642 and about 1663. He was not officially a member of the Clockmaker’s Company but was known to them and tolerated by them. His work is quite sophisticated and he was working at a time of political turmoil in England. This watch is of exactly mid 17th Century manufacture and is likely to have been made just after the restoration of Charles II rather than late in the reign of Charles I or during the Interregnum. Technically speaking it could fit into either period, but stylistically it is more typical of the early restoration.