Swiss gold filled digital jumping hour pocket watch Circa 1910

Gold filled keyless lever digital watch
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A fine Swiss, gold filled, keyless digital jumping hour pocket watch with the retrograde flyback minute hand, circa 1910. The back cover engine turned and with vacant cartouche. Hinged metal cuvette engraved in the Art Nouveau style. Matte silver dial, the upper half with retrograde Arabic minute sector, aperture for the jump hours below 12 o’clock, subsidiary seconds. A rhodium plated movement, Geneva striping decoration, 15 jewels, straight line lever escapement, notched bi metallic compensation balance, blued steel flat balance spring, index regulator. Cuvette engraved Modernista Patent. Movement with a patent number.
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Diameter: 50 mm
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Signed: Courvoisier Freres  Swiss
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The movement is slightly scratched.
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The mechanism is based on a Swiss patent No. 27838, issued to Gabriel Lopez Mantaras of Saragosse and registered on May 5, 1903. Modernista, registered in 1903, was Courvoisier Frères’ trademark for marketing Mantaras system watches.