Swiss 18K yellow gold open faced pocket watch Circa 1912

Gold open faced keyless lever watch
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A fine Swiss 18 carat yellow gold open faced pocket watch made by Patek Philippe & Co in Geneva, circa 1912. It has a mechanical crown winding movement with a straight line lever escapement, signed Patek Philippe & Cie. The white enamelled dial shows painted black Arabic numerals for the hours, a fine outer minute track with red Arabic five minute indicators from 5 to 60, a subsidiary seconds dial at 6 o’clock, and elegant gold Louis XV style hands.
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The timepiece is housed in a smooth round three body, 18 carat solid yellow gold open faced case with a plain polished reverse back cover engraved with an intertwined AB monogram, a fluted winding crown, and a round suspension bow. The solid 18 carat gold inner protective cuvette is signed Patek Philippe & Co and numbered. The watch comes with a gold plated metal chain, its original fitted presentation box, the original warranty certificate dated August 20, 1912, a 1957 factory warranty bulletin, and an original replacement crystal glass bearing the matching watch number.
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Diameter: 47 mm
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Weight: 82.4 g
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Signed: Patek Philippe & Cie Genève
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The original presentation box, the 1912 distribution certificate, and the 1957 service documentation offer an exceptionally rare, unbroken provenance. This significantly enhances the archival importance of this early twentieth century masterpiece.