English 18k gold chronometer pocket watch Circa 1874

Gold open faced pocket watch
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A solid pocket chronometer with rare English pivoted detent chronometer escapement, circa 1874.
An 18 carat gold case, case maker’s punch mark “JR”, enamel dial, roman numerals, full plate movement, keywind, chain/fusee, gold screw chronometer balance, freesprung blued helical balance spring.
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Diameter: 50 mm
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Weight: 135 g
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Signed:  Gompers  London