Swiss yellow gold open faced keyless lever watch Circa 1954

Gold open faced lever watch by Patek Philippe
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A Swiss 18 carat yellow gold open faced keyless watch, made in 1954. Manual wind nickel finished jewelled lever movement.
Silvered two tone matte dial with minute divisions and subsidiary constant seconds. 18k Yellow gold, snap-on case back. Case, dial, and movement signed, case and movement numbered.
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Diameter: 43.5 mm
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Signed: Patek Philippe Genève
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Patek Philippe Extract from the Archives confirming production of this watch in 1954 and its subsequent sale in 1955