English plain silver open faced pocket chronometer Circa 1856

Silver chronometer by Dent
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An English silver open faced keywound pocket chronometer, circa 1856. Full plate gilt finished spring detent movement, mono metallic balance, helical hairspring. White enamel dial with Roman numerals and large subsidiary seconds. Plain case. Dial and movement signed and numbered, case stamped with casemaker’s initials CBH and London date letter for 1856. Comes with a fitted mahogany deck box.
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Diameter: 57 mm
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Signed: F. Dent London Watchmaker to the Queen