Four Chinese characters / Blank. The size is about 24-25mm, the weight is 3 to 4 grams. Various types and a huge mix of varieties.

Unsorted coins. Interesting study group, lots of different varieties. A few have small casting holes, but mostly decent quality collectible coins. The picture is of the typical coins in this group. $5 per coin.

The Song Dynasty was a ruling dynasty in China between 960 and 1279; it succeeded the Five Dynasties and Ten Kingdoms Period, and was followed by the Yuan Dynasty. It was the first government in world history to issue banknotes or paper money, and the first Chinese government to establish a permanent standing navy. This dynasty also saw the first known use of gunpowder, as well as first discernment of true north using a compass. 

This coin is unconditionally guaranteed to be authentic.