L2140, Korea "San-Han Zhong-Bao" Ancient Coin, Regular Script, AD 1095-1104.
Fine, please refer the picture.
Minted by Ancient Korean emperor during around AD 1095-1104. One of the scarce coin in Korean history.
Please note this coin has heavy patina, which is the original patina. It is not suggested to clean it.
Charactor: Regular Script.
Size: 22 to 23 mm in diameter. Weight: around 3 to 4 gram.