Swiss 18K gold open faced pendant lever watch Circa 1907

Pocket watch with open face by Patek Philippe & Cie.
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A small Swiss keyless-winding open faced pendant watch, circa 1907.
12-Inch movement with lever escapement. Enamel dial with Breguet-style numerals, outer minutes track, subsidiary dial for the seconds, and original pear hands. Round-shaped 18K yellow gold case, case back engraved in taille-douce (fine-cut) with the cypher R F. Dial, case and movement signed.
Accompanied by the Extract from the Archives, dated October 18, 2019, that mentioned this watch was sold on January 11, 1909, and retailed by J. Fontan, Bordeaux.
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Diameter: 32 mm
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Signed: Patek Philippe & Cie. Genève