Rare Swiss mirror image pair of watches made for China Circa 1850

Open faced gold pocket watches made for the Chinese market
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A Swiss fine and very rare mirror image pair of floral enamelled 18 carat gold watches in the original presentation box with enamelled keys made for the Chinese market, circa 1850. Each with gilt bridge calibre cylinder movement, plain gilt balance, index regulator, key wound and set through the hinged gold cuvette.
White enamel dial with Roman chapters and blued steel Breguet hands. The case backs each with a finely painted floral bouquet in mirror image on blue reserve, the bezels, pendant and bow set with seed pearls, contained in their original tooled red leather fitted etui and retaining their original enamelled gold keys and spare crystals, signed on dials and movements, the cases with cameo maker’s marks B in a lozenge.
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Diameter: 33 mm
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Signed: Boyer à Genève
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Jean-Antoine Boyer and Charles Boyer, as Boyer & Fils, were makers and retailers of decorative watches from the 1820s to the 1870s.