English chronometer watch with power reserve Circa 1878

Silver chronometer pocket watch
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An English silver key wind open faced chronometer pocket watch, circa 1878. Gilt 3/4 plate, Earnshaw type spring detent escapement, cut bimetallic compensation balance, blued steel helical balance spring.
White enamel dial, black Roman numerals, black outer minute track, subsidiary seconds at 6, up/down register at 12, blued steel spade hands.
Later engine tuned hinged case. Dial and movement signed.
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Diameter: 53 mm
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Signed: Thomas F. Evans, 34 Spencer Street, Clerkenwell
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Including wooden box and key.