Charming Swiss gold open faced pendant watch Circa 1905

Gold, enamel and ruby set ladies’ watch
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A charming Swiss 18 carat yellow gold, enamel and ruby set open faced keyless pendant watch made by Omega in Bienne, circa 1905. The case back with grey-green translucent enamel over a guilloché ground showing a geometric pattern representing a rosaceous motif and chiselled ruby set bezels. White enamel dial with Arabic hour numerals, an outer minute track, subsidiary seconds at 6 o’clock and gold spade hands. Gilded brass movement with a going barrel, straight line lever escapement, cut bimetallic compensated balance, blued steel hairspring with terminal curve and polished steel index regulator. Signature on the dial and case.
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Diameter: 34 mm
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Signed: Ω Omega Bienne