Irish early interesting pocket chronometer Circa 1806-1820

Open faced pocket watch by James Scott  “Longitudinal Watchmaker”
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Early and very interesting Irish 18 carat gold pair cased pocket chronometer , circa 1806-1820. Chronometer movement with trapezoidal weights and diamond endstone, cylindrical hairspring, engraved bridge, Earnshaw spring detent escapement. White enamel dial with Roman numerals and seconds indication, gold hands. Casemaker’s punch JB for John Bolland, movement signed and numbered.
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Diameter: 60 mm
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Weight: 172 g
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Signed: Scott Dublin
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Important Irish Chronometer maker. ‘Longitudinal’ watchmaker.