Swiss repeating grande and petite sonnerie lever Circa 1905

Gold minute repeating grande/petite sonnerie striking clock watch by Invar 
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A very fine and very rare Swiss 18-carat gold hunting-cased minute repeating grande and petite sonnerie striking two-train keyless lever clock watch circa 1905. Frosted gilt movement, 31 jewels, two-train with tandem winding, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, index regulator, striking and repeating on gongs, the repeating activated by a push-button in the band, grande sonnerie/petite sonnerie/silence lever on the edge of the bezel. Gold hinged cuvette engraved with the technical details, glazed gold-rimmed cover to view the movement. Three-piece white enamel dial with bold Arabic numerals, outer minute divisions, subsidiary seconds dial, and original blued steel spade hands. Solid case, polished, the front engraved with a foliate monogram. Dial and movement signed, case numbered.
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Diameter: 55 mm
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Signed: Invar La Chaux-de-Fonds
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Invar was one of the trade names used by the firm of Achille Hirsch of La-Chaux-de-Fonds. It was reserved for the best quality watches made by Hirsch.
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Grande sonnerie striking: both the hours and the quarters are struck at each quarter.
Petite sonnerie striking: “ting-tang” quarters are struck at the quarter hours, but in which the hour is only struck at the hour.