Swiss cylinder in a gold enamel open faced case Circa 1870

Small gold and enamel ladies pendant watch
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A small Swiss cylinder in a gold and enamel open-faced case, circa 1870. Keywind gilt bar movement with suspended going barrel. Plain cock with polished steel regulator. Plain three arm gilt balance with blue steel spiral hairspring. Polished steel cylinder and steel escape wheel. White enamel dial with Roman numerals, blue steel Breguet hands. Small gold open face case with ribbed middle, black enamel back set with small diamonds. Wound and set through the signed gold cuvette.
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Diameter: 26 mm
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Signed: Pateck et Cie Geneve