Swiss hunting cased split seconds chronograph Circa 1921

Gold chronograph by Vacheron & Constantin
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Fine, rare and heavy 18 carat gold hunting cased keyless lever split seconds chronograph chronometer, circa 1921. Gilt finished double roller lever movement, bimetallic balance, micrometer regulator. Inscribed cuvette. White enamel dial with Breguet numerals, two subsidiary dials for 30 minute register and constant seconds, outer calibrated fifths seconds ring. Plain case, two rectangular buttons in the band for split chronograph. Case, cuvette, dial and movement signed.
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Diameter: 57 mm
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Signed: Vacheron & Constantin Genève