Rare Swiss gold, enamel and diamond ring watch Circa 1800

Rare gold, enamel and diamond ring watch made for the Turkish market
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A fine and rare Swiss gold, enamel and diamond ring watch made for the Turkish market, circa 1800, cylinder movement, blue enamel ground with engraved foliate decoration,
Eccentric white enamel dial with Turkish numerals, aperture to the upper half with visible balance set with diamonds, hexahedron case, diamond-set bezel, engraved band, polished sliding panel to the rear to reveal the winding and setting holes
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Length: 25 mm   Width: 20 mm
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Signed: No name