Swiss gold hunting cased keyless repeating pocket watch Circa 1920

Gold lever with chronograph and register
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A very fine and rare Swiss, 18K yellow gold hunting cased, keyless, minute repeating pocket watch with chronograph and 30 minute register, circa 1920. Trident by Vacheron & Constantin, Genève. A solid, polished case, hinged gold cuvette. White enamel dial with painted Breguet numerals, outer minute track, outermost 1/5th seconds chronograph divisions, 30 minute register, subsidiary seconds dial. Gold spade hands. A nickel movement, 28 jewels, straight line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, repeating on gongs by activating slide on the band. Case signed and number.
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Diameter: 55 mm
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Signed: Vacheron & Constantin  Genève
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The trademark Trident was registered by Vacheron & Constantin on October 29, 1902, under the number 15123.