American lever in a large silver open face case Circa 1905

Large silver American lever
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An American lever in a large silver open face case, circa 1905. Damascened nickelled full plate keyless movement with gold screws, going barrel. Plain cock with unusual polished steel micrometer regulator, gold sector index on the plate. Compensation balance with blue steel overcoil hairspring. Club foot lever escapement. Signed white enamel dial with subsidiary seconds, black Roman and red Arabic numerals for the minutes, and blue steel hands. Substantial silver open face case, decoratively engraved back, gold hinges, gilt winding button, and silver bow. Silver cuvette. Maker’s mark ‘Dueber’ in a rectangle.
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Diameter: 60 mm
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Signed: American Waltham Watch Co.