Core Insights - The first set of Renminbi is considered the "headliner" in the currency collection market, with a global total of fewer than 30 complete sets available, making it extremely rare [1] - Among the first set, the "Four Great Kings" are highly valuable, with each piece priced over one million [1] Group 1: Historical Context - The first set of Renminbi was issued on December 1, 1948, by the newly established People's Bank of China to unify the diverse currencies used in various liberated areas during the Chinese Civil War [3] - The first set consists of 12 denominations and 62 varieties, with many pieces regarded as exquisite collectibles in the numismatic community [3] Group 2: The Four Great Kings - The "Four Great Kings" of the first set include the 10,000 Yuan "Mongolian Horse" note, which is considered the most valuable [4][7] - The 5,000 Yuan "Mongolian Yurt" note was issued in Inner Mongolia and is extremely rare due to limited circulation and a lack of collection awareness at the time [9] - The 500 Yuan "Zhandecity" note is the smallest denomination among the "Four Great Kings," with an astronomical appreciation rate of 500,000 times [12] - The 10,000 Yuan "Camel Team" note features a design of camels in the desert and was issued in Xinjiang, making it another rare collectible [13][16]