T. P. Collection. They don't come much finer that this example of an imitation cowrie (C. Moneta) made of shell. Hartill doesn't detail all the classification sub-types possible in the imitation cowrie series, so we'll go with Hartill # 1.2, 19.5 x 13.2 mm. Note similarity to the stone/marble geometric style imitation = hole near the top, and diamond shape.
Archaic: Cowries, Spades & Knives
China - Mother of Pearl Shell Imitation Cowrie
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note similarity to the stone/marble geometric style imitation= hole near the top, and diamond shape.