American lever in engine turned gold full hunter case Circa 1910

Gold engine turned ladies’ full hunter
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An American lever in a gold engine turned, full hunter case, circa 1910. Small gilt three quarter plate keyless seven jewel movement with going barrel. Engraved cock with polished steel regulator, compensation balance with blue steel overcoil hairspring. Club foot lever escapement. Signed white enamel dial, subsidiary seconds, Roman numerals and blue steel hands. Small engine turned 14 Carat full hunter case, vacant shield shaped cartouche within a garter on the front cover. Plain gold cuvette and ribbed middle. Maker’s mark Keystone.
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Diameter: 36 mm
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Signed: Elgin Natl Watch Co U.S.A.
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Apparently unused, the engine turned still crisp.