Swiss gold astronomical Grand Complication watch Circa 1911

Gold Grand Complication watch by Patek Philippe
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A rare and important yellow gold open faced perpetual calendar split second chronograph watch with moon phases, circa 1911. Nickel lever movement, 39 jewels, bimetallic balance with pink gold screws, precision regulator, two hammers repeating on two gongs. 18 Carat yellow gold, varicolored enamel monogrammed hinged case back.
White enamel dial, Roman numerals and Arabic outer, blued steel spade hands, subsidiary dials for month, day, moon phases, and date combined with constant seconds, outer scale for minutes and 1/5 second divisions, 18 Carat yellow gold, varicolored enamel monogrammed hinged case back, minute repeating slide to the band at 9, split seconds pusher at 11, case, dial, and movement signed.
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Diameter: 54 mm
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Signed: Patek Philippe & Cie. Genève
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Accompanied by an Extract from the Archives confirming the date of sale in 1912, the case back engraved with the initials “W.A.B.” over three enamel colors. Additionally accompanied by a letter written to Mr Dominic J. Riat confirming archive details of the watch written by Alan Banbery for Patek Philippe dated November 5, 1976.
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This watch is an excellent example of an early 20th century Grand Complication watch from Patek Philippe. The Grand Complication was a staple of Patek’s production and consisted of the combination of three or more complications, represented in this watch by the split-second chronograph, perpetual calendar and minute repeater. This watch also retains a well preserved dial and case, the case with tight hinges and crisp hallmarks, and the dial with no hairlines.