Attractive Swiss 18k gold World Time lever watch Circa 1963

Very rare World Time watch by Patek Philippe
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A very rare and attractive Swiss 18 carat gold open faced World Time keyless lever watch, movement made in 1951, completed and encased in 1963. Mechanical movement, 18 jewels. Black enamel dial, applied gold baton numerals, pierced stylised gold hands, outer silvered ring with the names of 39 world locations, all centred by a revolving grey and white ring calibrated for the Arabic diurnal and nocturnal 24 hours. Plain case, milled bezel, snap on back. Case, dial and movement signed.
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Diameter: 44 mm
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Signed: Patek Philippe Genève