Very rare, impressive Swiss gold complicated watch Circa 1990

Gold open faced complicated clock watch by Patek Philippe
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A very rare and impressive Swiss 18 carat gold minute repeating perpetual calendar split seconds keyless lever chronograph clock watch with grande and petite sonnerie and moon phases, circa 1990. Grand Complication Model. Nickel finished lever movement, 44 jewels, bimetallic compensation balance, micrometer regulator, minute repeating and striking on two gongs activated by a slide in the band at 5 o’clock, glazed dust cover, tandem winding. White enamel dial with Roman numerals, blued steel hands, four subsidiary dials for constant seconds combined with date, day, month and 30 minute register combined with phases and ages of the moon. Heavy gold polished case with finely engine turned bezels and hidden hinge, chronograph button in the crown, split second mechanism operated by a button in the band at 11 o’clock along with the slide to lock the chronograph, slides for Strike/Silent function between 8 and 9 o’clock and Grande/Petite Sonnerie between 3 and 4 o’clock. Case, dial and movement signed.
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Diameter: 61 mm
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Signed: Patek Philippe Genève Switzerland