Swiss gold watch with Art Nouveau geometric, floral pattern Circa 1900

Gold open faced lever pocket watch 
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A fine Swiss, 18K yellow gold, open faced, keyless pocket watch, circa 1900. A polished case, case back with Art Nouveau geometric and floral pattern. Enamel dial with black Arabic numbers, outer minute track, sunken subsidiary seconds. Blued steel Breguet hands. A frosted gilt movement, 20 jewels, straight-line lever escapement, movement stamped twice with the Geneva seal, cut bimetallic compensation balance, blued steel Breguet balance spring, micrometre with swan’s neck regulator (partially missing). Dial, case and movement signed.
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Diameter: 48,5 mm
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Signed: Patek Philippe & Cie.  Genève