Swiss yellow gold open faced keyless lever watch Circa 1963

Yellow gold open faced keyless lever watch by Patek Philippe
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A Swiss yellow gold open faced keyless lever watch, circa 1963.
Manual winding nickel lever movement, stamped with the seal of Geneva, 18 jewels, mono-metallic compensation balance.
Gilt dial, applied baton indexes, baton hands, 18k yellow gold case with brushed outer ring, snap-on back, case, dial and movement signed.
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Diameter: 40.5 mm
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Signed: Patek Philippe Genève
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With an Extract from the Archives confirming manufacture in 1963 and sale in 1963.