Silver American Half Hunter

A 20^th Century American lever in an engine turned silver half hunter case.  Nickelled split three quarter plate seven jewel 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, 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.