Swiss gold open faced split seconds chronograph Circa 1908

Gold split seconds lever chronograph by Patek Philippe
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A fine Swiss 18 carat gold open faced split seconds chronograph keyless pocket watch, circa 1908. Keyless jewelled lever movement. Gold cuvette. White enamel dial with Breguet numerals, red Arabic outer calibrated 1/5th seconds ring, two sunken subsidiary dials for 30 minute register and constant seconds. Plain case, split seconds chronograph operated through the crown and a rectangular button in the band, hinged case back. Case, dial, and movement signed.
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Diameter: 50 mm
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Signed: Patek, Philippe & Cie – Genève