Rare English silver pair-cased pocket chronometer Circa 1798

Silver chronometer with spring detent escapement
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A rare English silver pair-cased pocket chronometer with spring detent escapement and temperature compensation by Thomas Earnshaw, circa 1798. A smooth à goutte outer case with maker’s mark TC, the inner case with maker’s mark TH. White enamel dial with radial Roman hours, outer minute divisions and auxiliary seconds at 6 o’clock and gold hands. Brass full plate movement, key wind, blued screws, chain and fusee, solid movement pillars, spring detent escapement, three-arm steel balance, sugar tongs temperature compensation, blued balance spring, chatoned endstone on escape wheel. Dial and movement signed and numbered.
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Diameter 60 mm
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Weight: 155 g
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Signed: Thomas Earnshaw Invt. et Fecit No. 800