Swiss 18k yellow gold and enamel keyless pendant watch Circa 1905

Gold open faced with lever escapement
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A fine Swiss, 18K yellow gold and enamel keyless pendant watch, circa 1905. A solid, polished case, bezel and back rim decorated with a foliage and leaf design in black enamel, the back cover engraved with a foliate monogram RO. Gold hinged cuvette White enamel dial with Arabic numerals, outer minute track, Gold Louis XV hands.
A frosted gilt movement, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, index regulator. Dial, case and cuvette signed, movement numbered.
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Thickness: 9 mm
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Diameter: 28  mm
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Signed: Philippe & Cie.  Genève