Rare English silver open faced pocket chronometer Circa 1797

Chronometer by Barraud
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A rare English silver open faced pocket chronometer in pair cases with Arnold’s detent escapement and regulator dial, circa 1797. Gilt finished movement, chain fusée, Arnold’s spring detent escapement, bimetallic Z balance with compensation weights, blued steel helical spiral, freesprung regulator with diamond endstone. White enamel regulator style dial, outer Arabic five minute indication with central minute hand, two small dials for hours with Roman numerals and single hand, constant seconds. Plain inner and outer cases. Cases stamped with casemaker’s initials ‘VW’ and London date letter for 1797, dial signed and numbered, movement signed.
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Diameter: 63.5 mm
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Signed: Barraud Cornhill London