English deck watch with eight days power reserve Circa 1953

Deck chronometer in mahogany box
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A large English deck chronometer with eight days power reserve and an electrical 30 seconds contact device in a mahogany box, circa 1953. Brass movement, chain and fusee, spring detent escapement according to Thomas Earnshaw, bimetallic chronometer balance with two screws and two weights. Silvered dial with Roman hours, outer minute divisions, power reserve indication at 12 o’clock, subsidiary seconds at 6 and an aperture for the second wheel with contact. Dial signed, case and movement numbered.
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Dimensions: 210 x 200 x 210 mm
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Signed: Thomas Mercer Ltd. St. Albans England