Swiss gold open faced split seconds chronograph Circa 1908

Gold chronograph keyless lever watch by Patek Philippe
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A fine Swiss 18 carat gold open faced split seconds chronograph keyless lever watch, circa 1908. Nickel finished jewelled lever movement, bimetallic compensation balance, micrometer regulator. Hinged gold cuvette. Enamel dial with Breguet numerals, outer red Arabic five minute divisions, two subsidiary dials for 30 minutes register and constant seconds. Plain case, hinged back, split seconds chronograph buttons in the band and in the crown. Case, cuvette, dial and movement signed.
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Diameter: 50 mm
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Signed: Patek, Philippe & Cie Genève