Swiss slim platinum open faced lever pocket watch Circa 1936 

Platinum open faced lever watch
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A Swiss slim platinum open faced keyless lever watch, made in 1936, manual winding nickel lever movement, stamped with the seal of Geneva, 18 jewels, mono-metallic compensation balance •
Silvered dial, applied baton indexes, subsidiary seconds, platinum case, snap-on case back, case, dial and movement signed.
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Diameter: 43 mm
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Signed: Patek Philippe & Cie. Genève
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With a Patek Philippe Extract from the Archives.