English gold and stone verge for the Ottoman market Circa 1800

Gold/stone lady’s pocket watch with an open face
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A rare, very fine English lady’s pocket watch for the Ottoman market with a gold/jasper stone case and diamond setting, circa 1800.
Finely decorated English verge movement in very beautiful quality. Signed Ottoman enamel dial with radial Ottoman numerals and blued Poker & Beetle hands. 18K gold jasper case with inlaid large rose-cut diamonds.
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Diameter: 33.5 mm
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Weight: 40 g
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Signed: In Ottoman
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Ottoman verge watches with stone cases in lady’s size are rare and rarely offered at auctions.
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Jasper, an aggregate of microgranular quartz and/or cryptocrystalline chalcedony and other mineral phases. Jasper breaks with a smooth surface and is used for ornamentation or as a gemstone. It can be highly polished and is used for items such as vases, seals, and snuff boxes.