Rare Nei series knife money, city of Yi, ca.400-220 BC, "Warring State" period, Yan Kingdom under the Eastern Zhou Dynasty

Large archaic Chinese character Yi (also can be read as "Ming") / Two large archaic characters Nei Qian (“inside (furnace), 1000”). 140mm long, 16.04 grams. Hartill #4.43, type #6.p.

Rare and high quality piece. From an old US collection (comes with the original collection box). Uncleaned.