What is liao type 13?

Liao type 13 is a type of ancient Chinese currency that was issued during the Liao dynasty (916-1125 AD). It was made of bronze, and its shape was generally rectangular or square. The size and weight of the coins varied, with some examples being quite small and light, while others were larger and heavier.

The coins typically featured inscriptions in the Khitan script, which was used by the Liao dynasty rulers. These inscriptions gave the name of the emperor who issued the coin, as well as other information such as the year of issue.

Liao type 13 coins were in circulation for a fairly short period of time, from around the middle of the 11th century until the fall of the Liao dynasty in 1125 AD. Today, these coins are highly sought-after by collectors of ancient Chinese currency, due to their historical significance and scarcity.