Rare Swiss nickel and gold buttonhole watch Circa 1890

Nickel and gold buttonhole watch
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An extremely rare Swiss nickel and gold buttonhole pocket watch, circa 1890. Frosted gilt bridge movement with a cylinder escapement and ring balance. Small white enamel dial with Arabic hour numerals, outer minute dots and blued Breguet hands. A polished case.
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Diameter: 28 mm
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Weight: 22 g
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Signed: No name