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Derived from a farmer’s tool, spade coins (bu) were considered a major currency in ancient China. Hollow and flat handled are two main classifications of spade coins. They are further subcategorized by slight variations in the “feet” and “shoulder” designs. Flat handled spades are classified by the shape of their “feet.” The types are Arched Foot Spade, Pointed Foot Spade, Square Foot Spade, Round Foot Spade or Three Hole Spade. Square Foot Spades are characterized by square feet and crutch, a line that crosses the middle on the obverse. This coin belongs to the Warring States period.