Swiss watch in pearl and ruby-set open-faced case Circa 1890

Pearl and ruby-set gold fob watch
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A small Swiss cylinder in a pearl and ruby set open-faced case, circa 1890. Keyless gilt bar movement with 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. Off white enamel dial, gilt five-minute markings, Arabic numerals within silver cartouches, pierced gilt hands. Small 18-carat open face case the bezels set with split pearls. Gold back set with larger split pearls, the spaces between them filled by small rubies, signed gold cuvette.
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Diameter: 25 mm
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Signed: Blondel