Rare English sterling silver pair cased coach clock Circa 1811

Silver pair cased coach watch by James Swingler
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An extremely heavy pair cased English verge pocket watch made of solid silver – with a heavy pocket watch chain of solid silver (365 mm, 135 g), circa 1811.
Two cases: outer case – silver, polished, à goutte, five piece lateral hinge; inner case – silver, polished, and with case maker punch mark MA (possible workshop of Mary Atkins). Enamel dial with Arabic numerals and arrow shaped hands. Full plate movement, key wind, frosted, gilt, chain/fusee, three arm steel balance, very finely engraved pierced balance cock with mascaron, chatoned diamond end stone on balance. This must be the heaviest normal size pocket watch we ever had at one of our auctions.
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Diameter: 66 mm
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Weight: 567 g. with chain
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Signed: James Swingler, Grantham