Swiss 18K yellow gold keyless pocket watch Circa 1910

Gold open faced lever pocket watch
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Very fine Swiss 18K yellow gold keyless pocket watch, circa 1910. A polished case with engraved band raised setting for monogram SDS on the back, engraved EER on the inside, hinged gold cuvette. Silver dial with applied yellow gold Breguet numerals, outer minute track, subsidiary seconds and yellow gold Breguet hands. Movement with 18 jewels, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, eight adjustments, and an index regulator. Dial, case and movement signed.
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Diameter: 45 mm
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Signed: Vacheron & Constantin  Genève
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The case is slightly scratched.