Large silver English verge, seconds and calendar Circa 1819

Large silver calendar verge pocket watch
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A large English verge with seconds and calendar in silver pair cases, hallmarked London circa 1819. Full plate gilt keywind fusee movement. Engraved mask cock with diamond endstone, plain flat three-arm polished steel balance with blue steel spiral hairspring, gilt Bosley regulator. White enamel dial with subsidiaries for calendar and seconds, Roman numerals, blue steel seconds hand, and gilt hands. Matching silver pair cases, silver oval pendant and bow.
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Diameter: 63 mm
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Signed: J. Alexander London
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Unusually the calendar is set by hand. The watch has been made without any automatic mechanism and it would not be possible to fit one unless a thicker dial plate was used.