Swiss 18k gold hunting cased complicated watch Circa 1900

Gold complicated lever watch by Volta
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Fine, large Swiss 18 carat gold hunting cased minute repeating keyless pocket watch with triple date calendar, chronograph and moon phases, circa 1900. Frosted gilt movement, 19 jewels, straight line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, centrifugal governor, index regulator, repeating on gongs activated by a push button on the band. Movement based on the Swiss patent 15833. Case signed and numbered.
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Diameter: 58 mm
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Signed: Volta