English lever watch with 30h power reserve indicator Circa 1874

Gold open faced lever watch
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A very fine English lever pocket watch with 30 hour power reserve indicator, circa 1874. Gilt 3/4 plate English lever, cut and compensated bimetallic balance.
White enamel dial, black Roman numerals, black outer minute track, subsidiary seconds at 6, up/down register at 12, blued steel spade hands. Polished round case. Signed dial & movement, case stamped HWB.
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Diameter: 48 mm
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Signed: Hennessy, 5 Wind Street, Swansea
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Including 9K rose gold chain and key.