Very fine Swiss 18K gold complicated lever watch Circa 1900

Gold open faced complicated watch by Leon N. Robert
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A very fine Swiss 18 carat gold open faced minute repeating keyless lever pocket watch with a triple date calendar, chronograph, register and moon phases, circa 1900. Rhodium-plated movement, 25 jewels, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, index regulator, repeating on gongs activated by a push-button in the band, chronograph with visible work activated by a push-button in the crown. Gold hinged cuvette engraved with the technical details and Medaille D’Or 1895, glazed gold-rimmed cover to view the movement. White enamel dial with Roman numerals, outer minute track and fifths of a second chronograph divisions, subsidiary dials for the date concentric with 30-minute register, apertures for days of the week the months, the seconds with inner moon phase aperture and original gold Louis XVI hands. Massive, engine-turned case, the back with an engraved monogram in a cartouche. Cuvette signed Clinton Extra, movement and case numbered.
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Diameter: 56 mm
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Signed: Leon N. Robert La Chaux-de-Fonds Swiss