but rather "齊複邦長法化" or "齊返邦長法化". In this context this inscription refers to a "return" instead of an "establishment". This alternative reading may be a reference to an event where Duke Tai of Tian Qi defeated the Yan military at Jimo in the year 284 BC, which allowed the return King Xiang of Qi from the State of Ju back to Linzi, the Qi capital, in the year 279 BC. While the obverse side of Six Character Knives feature six Chinese characters, the reverse side usually only contain one character. It is believed that this character may refer to the knife's denomination or served as a type of mint mark, alternatively as these knives were cast in stone moulds, it is believed that other characters on the reverse side may indicate in which mould the knife was cast. The character "十" (ten) is generally believed to be a denomination, while the characters "司" (Si), "工" (Gong), and "日" (Ri) are believed to represent the names of newly established mints in the city of Linzi, where all the Six Character Knives were cast. The rarest Chinese characters found on the reverse sides of Six Character Knives are "化" (Hua) and "上" (Shang). Purchasing power of Qi knives Professor Song Jie () wrote in an academic paper entitled "A History of China’s Ancient Money" () about the contemporary purchasing power of a Qi knife. During the late Warring States Period, one dou (斗) of rice, equivalent to about 10 litres, could be purchased with 3 Ban Liang cash coins. According to Professor Song Jie, a Qi knife would have been the equivalent of 7 or 8 Ban Liang cash coins. Therefore, one Qi knife would have been able to buy more than 2 dou or 23 to 26 litres of rice. Qi knives in the Qi Heritage Museum The largest collection of Qi knife money in the world is located at the Qi Heritage Museum (齐文化博物院) in Linzi, Shandong. This museum is located at the site of what once was the capital city of the State of Qin. All the artifacts in the collection of the Qi Heritage Museum have been obtained through archaeological excavations. Commemorative knife money The Six Character Knives (六字刀) issued by the State of Qi were the first Chinese form of money to commemorate the founding of a new ruling family or dynasty (開國紀念幣). Because they were sometimes cast