5 Zhu ("Western Han" type; with top rim)

The 5 Zhu coin was introduced in 113 BCE during the reign of Emperor Wu of the Western Han dynasty. This standardization effort was designed to consolidate monetary control under the central government, effectively ending the circulation of varied, locally minted currencies and curbing the influence of private mints. The design, characterized by the iconic round shape with a square center hole, provided a durable and easily strung medium of exchange that served as the standard for Chinese coinage for over seven hundred years.

The physical design of the 5 Zhu coin reflects a sophisticated understanding of metallurgy and administrative efficiency. The '5 Zhu' inscription was calligraphed in the refined seal script of the era, and the inclusion of the raised top rim was a structural innovation intended to protect the coin's face from wear during the casting process and subsequent circulation. It was received as a stabilizing force for the Han economy, providing a uniform weight and purity that facilitated trade across the expanding empire.