Swiss unusual Vacheron & Constantin pendant watch Circa 1907

18 Carat gold keyless pendant watch
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A very fine rare and unusual keyless 18 Carat gold pendant watch, made by Vacheron & Constantin in Genève, Switzerland circa 1907. Four body and solid case it’s back with monogram initials and a gold hinged cuvette.
White enamel dial with inner Roman numerals, outer minute track, outermost oversized Arabic five-minute numerals, subsidiary seconds and yellow gold Louis XV hands.
M. Gilt movement with 15 jewels, straight-line lever escapement, cut bimetallic compensation balance, blued steel flat balance spring and an index regulator.
Dial, case, cuvette and movement signed.
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Diameter: 30 mm
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Thickness: 11.5 mm
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Signed: Vacheron & Constantin, Genève