Fine English gold watch with perpetual calendar Circa 1875

Gold watch with perpetual calendar and moon phases
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A fine English 18K gold astronomic hunting cased keyless pocket watch with perpetual calendar and moon phases, circa 1875. Gilt half-plate movement, jewels with screwed chatons, lateral lever escapement, cut bimetallic compensation balance, flat blued steel balance spring, diamond endstone, index regulator.
Case polished. Hinged gold cuvette.
White enamel dial with radial Roman numerals, outer minute track, subsidiary dials for the seconds, date, days of the week and months, moon phase aperture at 12. Blued steel spade hands. Movement signed.
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Diameter: 53 mm
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Signed: Hamilton & Co., London & Calcutta