5 Zhu ("Goose eye" type)

The 5 Zhu coin was introduced during the Western Han Dynasty to standardize a currency system that had previously suffered from erratic private minting and inconsistent weight. By the time this specific issue was minted around 73 BCE, the coin had become the backbone of the Chinese economy, valued for its durability and the reliability of its weight standard. These coins were cast in bronze using clay molds, representing a significant technical effort by the central government to maintain fiscal control across a vast and expanding empire.

The 'goose eye' variant, or 'eyelid' coin, refers to the small, thin, and often irregularly shaped specimens that emerged when official standards began to degrade or when private debasement crept back into circulation. While the official 5 Zhu was intended to be substantial, these lighter pieces reflect the historical reality of economic strain and the eventual transition toward different monetary standards in later dynasties. They are prized by collectors today as tactile remnants of the Han period's daily commerce and administrative reach.