Swiss yellow 18 carat gold open faced lever watch Circa 1904

Gold open faced keyless lever watch
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A Swiss yellow gold open faced keyless lever watch, made in 1904, manual winding jewelled nickel lever movement, cut bimetallic compensation balance, index regulator.
White enamel dial, Arabic numerals, outer minute track, subsidiary seconds, 18k yellow gold case, snap-on case back, case, dial and movement signed.
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Diameter: 31.5 mm
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Signed: Patek Philippe Genève
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With a Patek Philippe Extract from the Archives.