Qi is a knife-shaped coin like a knife. According to local customs, the State of Qi forged a copper coin shaped like a knife (bronze knife), which was called "knife coin". Knife coins were first used in Qi State, but in the Warring States period, they also circulated in parallel with cloth coins in Zhao Yan and other places. Because of the different casting locations and shapes, knife coins have formed three series: Qi Dao, Yan Dao and Zhao Dao. Zhao Dao has a straight blade, slightly curved back and blade, oval ring, small ring hole and blunt head, so it is also called "straight knife" and "round head knife". The big one is13.814cm long,1.5cm wide and weighs about 8.8g.. There are many words such as "Tian" and numbers on the back, and the words and outer edges are thinner. The smallest one, short and narrow, thin, straight back, slightly concave blade and silhouette. The handle also has two ridges. The handle bottom is flat, the hole is oval, the total length is 12.5cm, the head width is 1.3cm, and the weight is more than 3.5g Another kind of Zhao Dao is "small straight Dao", which is a very small knife coin. Short body, straight blade, almost no arc, no chin folding, oval head, no ridge on the handle, no words on the back, rough production, but the inscription on the front is overall vigorous and exquisite calligraphy. Generally, it is 9- 10 cm long, 9-1 cm wide and weighs about 6 grams, and the shortest is only 7 cm. There are four kinds of facial expressions: Golden Flower, Golden Plate, Jinyang and Jinyang Xinhua. At present, it is very rare and rare.

Zhao's is a shovel-shaped coin, and its scientific name is cloth coin.

Cloth coins were the enduring currency varieties in the same period of pre-Qin, and their shapes were modeled after the production tool "shovel" at that time.

Qin is a round square hole money.

Chu is an ant nose money, which is transformed from imitation shells. The most common word seems to be the word "shell" in ancient Chinese, and some people think it is the word "gold" in ancient Chinese, which looks like a human face and is commonly known as "grimace money". Another way of writing is generally interpreted as "six Zhu Ge" or "one Zhu Ge". The three words are connected together and the strokes are like ants. Because the two "mouths" are like nostrils, they are commonly called "ant nose money".

Yan State Knife Coin

The word "Ming" is cast on it, so this kind of Dao is commonly called Ming Dao, which is lighter and smaller than Qi Dao and about 13 ~ 14 cm high. In the early stage, the shape of the vessel was large, the back of the knife was slightly curved, and the blade was narrow, with a height of about 14 cm and a weight of about13 g. The word "Ming" was "Qi" and "Miao", and the back text was mostly one word. The shape of the middle stage is slightly smaller than that of the early stage, and the word "Ming" is "Wei"; In the later stage, the blade body is equal in width, the back of the blade is straight, the handle is obviously bent inward, and the weight of the blade body is reduced to about 10g. The word "Ming" is written as "debt", and some people misinterpret it as "Wei" or "Yi". In the middle and late period, there are generally more words in the later articles, and they are generally numbered under "left" or "middle" or "right".