Swiss gold, platinum and enamel Belle Epoque watch Circa 1905

Gold open faced cylinder watch 
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A very fine Swiss, keyless, 18K gold, platinum, enamel Belle Epoque and diamond-set lady’s pendant watch, circa 1905. The bezel with grey guilloche enamel and white enamel line decoration, polished band, the back cover overlaid with grey guilloche enamel over line engine-turning painted white flower decoration, applied platinum and diamond-set decoration, outer border to match the bezel. Hinged gold cuvette. Matte silver dial with Breguet numerals, outer minute track. Blued steel Breguet hands. A matte gilt, bar calibre, eight jewels, cylinder escapement, three-arm brass balance, blued steel flat balance spring, index regulator.
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Diameter: 27 mm
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Signed: No Name
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The dial is slightly oxidized.