Swiss 18K gold open faced precision pocket watch Circa 1921

Gold anker chronometer by Vacheron & Constantin
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A very fine Swiss 18 carat gold open faced precision pocket watch, circa 1921. Bridge movement, a piston tooth lever escapement, patented fine adjustment with a threaded rod and knurled screw – Patent May 24th, 1904 and gold screw compensation balance. White enamel dial with black Arabic hours, an outer minute track, red Arabic five minute numerals, sunk subsidiary seconds at 6 o’clock and spade & whip hands. A plain case. Dial signed, cuvette signed and inscribed Chronomètre, case numbered, movement signed and numbered.
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Diameter: 52 mm
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Weight: 97 g
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Signed: Vacheron & Constantin Genève Suisse