English gold chronometer, numbered enamel dial Circa 1795

Very early gold open face pocket watch
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An 18 carat gold case, maker’s punch TH, very fine and early chronometer with spring detent escapement, hallmarks London  circa 1795.
Arnold’s bimetallic balance, special escape wheel with contrary teeth, gold hairspring, beautiful engraving and pierced balance bridge.
Main plate is signed Henshaw London Invenit et Fecit, No.461.
Numbered enamel dial in perfect condition, subsidiary seconds, pink gold hands, very beautiful original condition, case with small dents.
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Diameter: 51 mm   Weight: 129 g
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Signed:  Henshaw  London
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English chronometer rarity  maybe from Arnold’s workshop.