Very fine Swiss 18K gold pivot detent chronometer Circa 1860

Gold pocket chronometer
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A very fine Swiss 18 carat gold open faced key wound pocket chronometer, circa 1860. The movement with a pivot detent escapement. White enamel dial with Roman hour numerals, an outer minute track, sunk subsidiary seconds at 6 o’clock and fine, original hands with blued tips. A plain case with reeded band. Case and cuvette numbered.
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Diameter: 48 mm
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Signed: No name