This mother of pearl is Chinese antique, it was used for Chinese game counter or gambling chips in 1800s. 

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Material: Chinese antique mother of pearl

Size: Approx.    65.5 mm x 13.9 mm  ( 2.58 inches x 0.54 inch  )

Weight: Approx.     2.1 g

Color:   White

Quantity: 1 pc