½ Liang (Type 4; reversed legend)

The Ban Liang coin, or half-tael, was introduced during the Qin Dynasty following the unification of China in 221 BCE to standardize the nation's fragmented currency system. The design, featuring a circular shape with a central square hole, became the template for Chinese coinage for over two millennia, representing the harmony between heaven and earth. These early bronze coins were cast in sand molds, reflecting the transition from nomadic barter economies to a centralized imperial administration that required a reliable medium of exchange.

The specific Type 4 variant, characterized by a reversed legend, is a notable curiosity in numismatic history. While the standard Ban Liang features the characters 'Ban' and 'Liang' oriented to be read top-to-bottom or right-to-left, the reversed legend variety suggests variations in local minting practices during the early Western Han period. Historians and numismatists view these variations as evidence of the decentralized casting operations that persisted despite the state's efforts to centralize production, highlighting the tension between imperial authority and local artisans during this formative era.