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 solid silver chain (365 mm, 135 g), circa 1811. Two cases: outer case – silver, polished, à goutte, five piece lateral hinge; inner case – silver, polished, 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 have ever had at one of our auctions.
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Diameter: 66 mm
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Weight: 567 g
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Signed: James Swingler Grantham
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James Swingler, English watchmaker
James Swingler was based in Grantham around 1800 and worked at the Westgate. Other watchmakers in Grantham at the time were Francis Hebden (Westgate), George Johnson (Swingate), Orson Rasin (High Street), Benjamim Parr (Vine Street), and Thomas Saltby (Market Place). Swingler was also mentioned as a straw hatmaker. According to the London Gazette, he was declared bankrupt in February 1825.
Grantham is a market town in the English county of Lincolnshire and the administrative seat of the district South Kesteven. The town, about 35 km east of Nottingham, became famous as the hometown of Margaret Thatcher and the early training centre of Isaac Newton.