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The casting time of original hollow spade coin was at least in the early term of Spring and Autumn Period, then developed into flat shoulder hollow head spade cion of Xin Zheng type, Qu Wo type and little raised shoulder hollow head spade coin of Xin Jiang type, on this base, they developed into Song Xian type and Shou Yang type apart, at last, they evolved as the familiar kinds of flat shoulder and raised shoulder hollow spade coins.
The casting time of original hollow spade coin was at least in the early term of Spring and Autumn Period, then developed into flat shoulder hollow head spade cion of Xin Zheng type, Qu Wo type and little raised shoulder hollow head spade coin of Xin Jiang type , on this base, they developed into Song Xian type and Shou Yang type apart, at last, they evolved as the familiar kinds of flat shoulder and raised shoulder hollow spade coins.