Swiss 18k gold chronograph lever watch Circa 1917

Yellow gold lever by Patek Philippe
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A very fine and rare, manual wind 18K yellow gold open face case pocket watch with chronograph, circa 1917. Nickel lever movement.
White enamel dial, Roman numerals, subsidiary seconds, gilt spade hands, 18k yellow gold plaun case, Case, dial and movement signed.
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Diameter: 56 mm
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Signed: Patek Philippe & Cie Genève
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With riginal fitted box.