English temperature compensation pocket chronometer Circa 1803

Silver pair cased chronometer with spring detent escapement
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An English pair cased pocket watch by Thomas Earnshaw with sugar-tongs temperature compensation and spring detent escapement from Barrauds Earnshaw Series, circa 1803.
Two cases: outer case – silver, polished, à goutte; inner case – silver, polished, with case maker’s punch mark TG. Signed, numbered, enamel dial with radial Roman hours, auxiliary seconds, and gold Breguet hands. Keywind, frosted, gilt full plate movement with chain/fusee, moulded pillars, spring detent escapement, three-arm brass balance, balance cock signed and numbered, sugar tongs– temperature compensation for blued balance spring, chatoned endstone on balance, and chatoned sapphire endstone on the escape wheel.
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Diameter: 59 mm
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Weight: 184 g
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Signed: Barraud, Cornhill, London
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This pocket chronometer is part of the so-called “Earnshaw Series”, a number of pocket chronometers that are very likely to have been created by Thomas Earnshaw. They are all fitted with a mechanism only Earnshaw used at the time: this number 10/5342 as well as five other known watches with the numbers 7/5227, 13/5345, 28/ 5812, 31/5815 and 32/5816 all use the so-called “sugar tongs” temperature compensation.