Swiss green gold open faced complicated watch Circa 1912

Gold lever watch by Patek Philippe
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A fine and rare green gold and enamel open faced perpetual calendar split seconds chronograph minute repeating watch with moon phases, circa 1912. Nickel lever movement, bi metallic balance, 35 jewels, two hammers repeating on two gongs, 14k gold dial, painted black Arabic numerals, blued steel Breguet hands, four sunken subsidiary dials indicating day, 60 minute register combined with leap year and month indication, date, constant seconds and ages of the moon combined with fan form aperture for moon phases, outer minute and 1/5 second divisions, 18k green gold case, bezels and Murat style pendant with Greek key enamel pattern, calendar correctors under the bezel cover, chronograph activated through the crown, split chronograph pusher and minute repeating slide to the band, enamel monogram to the exterior of the case back, case and movement signed, with an associated chain.
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Diameter: 48,5 mm
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Signed:  Audemars Piguet
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Property from a Rhode Island Estate
Accompanied by an Audemars Piguet Certificate of Authenticity confirming the completion of the movement in 1912, with further sale on May 25, 1923.
Audemars Piguet confirms the completion of the movement in 1912, with further sale to Wittnauer, New York, in 1923 for 3,000 USD.
It is interesting to note that the published examples, No. 14827 and 13927, are both retailed by Gübelin and furthermore feature similar Greek key enamel motifs and stylized numerals. The former is in yellow gold and the latter is in white gold. To the best of our knowledge, the present example is the only one of its kind known in green gold.