Very rare, important Swiss complicated watch Circa 1907

Gold open  faced complicated watch by Patek Philippe
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An extremely rare, important and probably unique Swiss 18 carat gold open faced two train minute repeating keyless perpetual calendar watch with moon phases, manufactured in 1907, encased in 1956. Retailed by Tiffany & Co. Nickel finished two train lever movement, 33 jewels, bimetallic compensation balance, micrometer regulator, minute repeating on two gongs activated through a button in the crown. Silvered matte dial, applied gold baton numerals, black enamel outer minute divisions, triple apertures for day, date and month, subsidiary seconds combined with phases of the moon. Plain case, snap on back. Case, dial and movement signed by maker, dial signed by retailer.
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Diameter: 50 mm
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Signed: Tiffany & Co. Patek Philippe Genève Swiss