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This is a nice antique carved demi coco nut.
Certainly a cup made by a sailor or a prisoner.
Nicely engraved by hand:
Dimensions: 12,8 x 8,3 cm
Hight: 4 cm
Period: 1800 - 1830
Good condition.
Little hole made on purpose, certainly for a lace:
a good collectable !
Here is a converter inches / cm to help you with the dimensions.