Swiss gold clockwatch with sixteen grande complications Circa 1991

Gold open faced lever pocket watch 
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Highly exceptional and extremely important, unique Swiss, 18K gold, keyless grande complication pocket watch, circa 1991. Sold on November 29th, 2000, published in the 1993 Patek Philippe catalogue. Ultra-Complicated with sixteen complications, Grande and Petite Sonnerie clockwatch with trip minute repeating, split-seconds chronograph, instantaneous 30-minute register, instantaneous perpetual calendar with phases of the moon, the lunar calendar and 24-hour indication. Accompanied by a fitted box and the Extract from the Archives. A massive, polished case, push-button for the split-seconds at 10:30, chronograph safety bolt at 11, switch from petite to grande sonnerie at 3, silent/striking switch at 9. Gold hinged cuvette.
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Matte white dial, radial Roman numerals, outer minute divisions, outermost chronograph track with fifths of second divisions and Arabic five second/minute numerals, four subsidiary dials for days of the week concentric with 24-hour indication, date concentric with seconds, months concentric with leap year indication, aperture for the phases of the moon and moon’s age concentric with minute register. Blued steel spade hands.
A rhodium-plated movement, Geneva striping decoration, two-train, tandem winding, stamped with the Seal of Geneva Quality Mark, 44 jewels, adjusted to temperature, isochronism and five positions, straight-line counterpoised lever escapement, cut bimetallic compensation balance with blued steel Breguet balance spring, swan-neck micrometric regulator, repeating on gongs by tripping a small slide in the band at 5 o’clock. Dial, case and movement signed.
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Diameter: 60 mm
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Signed: Patek Philippe  Geneva
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The Seal of Geneva Quality Mark is a trademark of the Office of Geneva Control of Watches. It was established on November 6, 1886, amended several times with the largest change incorporated on December 10, 1955. Its function was to voluntarily control watches made in the Canton of Geneva. Paragraph 3 of the statutes state that the watches awarded the Seal of Geneva Quality Mark must after examination prove to have a perfect mechanism to ensure regular and durable functioning.