Swiss 18K yellow gold open faced lever watch Circa 1909

Gold keyless winding pendant watch
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A Swiss 18 carat yellow gold open faced keyless lever pocket watch made by International Watch Co. in Schaffhausen, circa 1909. An engine turned case back, engraved in the center with the monogram MC, the cuvette is inscribed Grand Prix Milan 1906 Médaille d’or. White enamel dial with radial Roman hour numerals, an outer minute track, subsidiary seconds at 6 o’clock and decorative gilded metal Louis XV hands. A gilt brass ¾ plate movement, going barrel with patented device, gold screwed chatons, straight line lever escapement, cut bimetallic compensated balance with gold poising screws and blued steel hairspring with terminal curve, polished steel index regulator. Dial signed.
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Diameter: 30 mm
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Weight: 23 g
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Signed: International Watch Co.
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Accompanied by a copy of the invention patent.
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Movement based on Swiss patent No. 31 457, issued on May 11, 1904, to Fabrique d’Horlogerie de J. Rauschenbach, Schaffhausen, for a device for limiting the winding of barrel type watch movements.