½ Liang (Type 4)

The Ban Liang coin represents a pivotal moment in Chinese numismatic history, emerging during the transition from the Warring States period to the unification of China under the Qin Dynasty. Standardized by Qin Shi Huang around 210 BCE, these coins were designed to replace the diverse and inconvenient currencies of the previous era with a singular, circular aesthetic that reflected the cosmological view of a round heaven and a square earth. This Type 4 iteration, dating roughly to 175 BCE, reflects the continued use of this design philosophy by the early Western Han Dynasty, which maintained the Ban Liang weight standard before later transitioning to the Wu Zhu coinage.

The design of the Ban Liang, characterized by the two distinct characters 'Ban' and 'Liang' flanking a square center hole, was a deliberate move toward economic centralization and administrative control. Crafted through sand-casting methods, these coins were meant to be easily stringed together for bulk transactions. While the calligraphy on these pieces can vary based on regional minting practices of the time, they were received as a necessary tool for the consolidation of the empire's internal markets and remain a primary artifact for historians studying the solidification of early Chinese economic policy.