Swiss gold chronograph pocket watch with register Circa 1910

Gold keyless hunting cased lever
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A rare Swiss 18K gold keyless hunting cased pocket watch with register, circa 1910. The cover with an engraved monogram and, a button in the band for the start/stop/return- to-zero functions of the chronograph. Hinged gold cuvette, white enamel dial with Breguet numerals, outer red Arabic five-second numerals, minute track and fifths of a second division, subsidiary seconds and 30-minute register and blued steel spade hands. Matte gilt movement, 23 jewels, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, swan-neck micrometre regulator, visible chronograph work. Dial, case, cuvette and movement signed.
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Thickness: 13 mm
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Diameter: 53 mm
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Signed: Vacheron & Constantin  Genève
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30 minutes counter enamel disc is replaced.