Swiss gold calendar watch by Patek Philippe Circa 1872-1874

Gold astronomical pocket watch
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A very fine and early, 18K pink gold Swiss, astronomical, keyless pocket watch with perpetual calendar and moon phases and lunar calendar, circa 1872-1874. Accompanied by the Extract from the Archives. Hinged gold cuvette.
White enamel dial with radial Roman numerals, outer minutes track, subsidiary dials for days of the week, months, subsidiary seconds with inner black date ring, moon phase aperture with its age on the border. Decorative gold hands. A frosted gilt movement, jewelled, wolf’s tooth winding, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, index regulator. Movement and dial signed.
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Diameter: 52 mm
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Signed: Patek Philippe
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Accessories: Patek Philippe letter dated 1982, confirming the sale to Randolph & Co, San Francisco in 1879 and a Patek Philippe Geneva overhaul receipt of 16’501 euros dated October 2017.