Rare English silver open-faced duplex pocket watch Circa 1821

Silver open faced duplex by James F. Cole
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A rare English silver open-faced duplex watch, circa 1821, gilt partly skeletonized movement engraved with foliate scrolls, foliate engraved cocks, duplex escapement, plain steel balance, spiral balance spring with regulator, diamond endstone, off-white enamel dial with Roman numerals, outer Arabic minute track and blued steel moon hands, plain polished case, reeded band, case maker’s mark HJ for Henry Jackson, movement signed James F. Cole London, dial signed Cole London.
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Diameter: 56 mm
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Signed: James F. Cole London
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This watch is thought to be one of the two earliest watches known by Cole. The other, with number code sx and in a case with the same hallmark date, resides in the British Museum. For an extensive biography about James Ferguson Cole and his work see Paul M. Chamberlain’s book “It’s About Time”.