Ivory products before domestic 1989 can be bought and sold, and must be certified by relevant departments. After 1989, ivory was not allowed to be bought or sold in China. It is a criminal offence to exceed 1 kg, and it will be indefinite if it exceeds 70 kg, and the maximum penalty is death. If the customs finds a small quantity, it will confiscate it, and if the quantity is large, it will "go in". It's best not to take any chances.

This object of yours is an antique, and it is definitely not acceptable to buy and sell it publicly, but collectors can exchange their collections with each other.