American lever in an engine turned silver case Circa 1927

Silver American half hunter
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An American lever in an engine turned silver half hunter case, hallmarked Birmingham circa 1927. Nickelled split three quarter plate seven jewels keyless movement with going barrel. Plain cock with polished steel regulator, compensation balance with blue steel overcoil hairspring. Club foot lever escapement. Signed white enamel dial with subsidiary seconds, Roman numerals and blue steel half hunter hands. Engine turned silver half hunter case with blue enamel chapter ring. Silver cuvette. Maker’s mark ‘ALD’ in a rectangle.
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Diameter: 51 mm
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Signed: Waltham