Extremely fine, very rare Swiss gold tourbillon lever Circa 1938

Gold open faced keyless lever tourbillon watch by Patek Philippe
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An extremely fine and very rare Swiss 18 carat gold open faced keyless lever tourbillon watch, encased in 1938. Nickel finished lever movement (manufactured in 1930) engraved PXP, numbered twice and stamped twice with the Geneva seal, 18 jewels, Guillaume balance with gold poising screws, polished steel three armed one minute tourbillon cage by Hector Golay, central jewel set in gold screwed chaton, blued steel hairspring. Hinged gold cuvette. Silvered matte dial with applied gold Breguet numerals, gold moon style hands, outer silvered dot minute divisions and subsidiary seconds. Plain case with hidden hinges. Case, cuvette, dial and movement signed, case and movement numbered.
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Diameter: 48.3 mm
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Signed: Patek, Philippe & Cie Genève