The 736-year reign of a single coin design
In short: Imagine a currency so stable that a single design remained valid for nearly eight centuries. The Chinese Wu Zhu cash coin achieved this feat, outlasting empires and maintaining its utility from 118 BC until 618 AD. It remains the longest-running coin in human history.
The evolution of Chinese currency began with the barter of agricultural tools. Around 1200 BC, tokens shaped like spades and knives were used for small exchanges, eventually being melted down to create real farm implements. This transition from functional tools to 'spade money' and 'knife money' laid the groundwork for the first standardized circular coins. After Qin Shi Huang united China, the circular coin featuring a square middle opening emerged as the standard, representing the 'square earth' and 'round sky'.
The Wu Zhu cash coin represents a pinnacle of monetary longevity. Introduced in 118 BC to replace the San Zhu, its production was briefly halted by Wang Mang but resumed for centuries. It remained the standard for 736 years, a record for any coin in history. To ensure consistency, the Han dynasty developed master bronze moulds. By the 6th century, the 'mother coin' system was introduced, where coins were cast in sand moulds using a 'coin tree' method. This allowed for the mass production of coins that were then rounded on square rods and strung together.
By the late Qing dynasty, the production of these coins shifted from manual casting to machine-striking. In 1889, a machine-operated mint in Guangzhou began producing brass cash coins, which often contained higher amounts of lead and tin due to copper shortages. While the traditional cash coin eventually faded as a primary currency by the 20th century, its influence persists. It inspired currencies across the Sinosphere, including the Japanese mon and Vietnamese văn, and remains a symbol of good luck in modern Chinese culture.
The term 'cash' itself has a complex linguistic journey. It derives from the Portuguese 'caixa,' which came from the Tamil 'kāsu,' a South Indian unit based on the Sanskrit weight unit 'karsa.' This name was first applied to small copper coins in British India before being adopted for the Chinese coins of similar value.
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- Summary by Intellect · source: Cash (Chinese coin)
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