½ Liang (Type 3; legend repeated)

The Ban Liang coin represents a pivotal moment in Chinese numismatic history, emerging during the Qin Dynasty following the unification of China under Qin Shi Huang in 221 BC. As part of a sweeping program to standardize currency, weights, and measures across the newly unified empire, the circular shape with a square hole became the mandatory design for all official coinage. This specific Type 3 iteration, characterized by the repetition of the 'Ban Liang' legend, reflects the transition toward stricter state control over currency production to replace the diverse regional knife and spade monies that had circulated previously.

The design of the Ban Liang was intentionally minimalist, utilizing a bronze circular frame that symbolized the heavens and a square center representing the earth. While the legends were inscribed with early clerical or seal scripts, the manufacturing process involved sand-casting, which often resulted in slight variations in weight and diameter. Its reception was initially met with some resistance from regional merchants, but it ultimately succeeded in stabilizing the imperial economy and established the foundational aesthetic for Chinese coinage that would remain largely unchanged for over two thousand years.