50 Mei Bank of China

The Bank of China's 1919 issues occupy an awkward moment in the institution's history — reorganized under the Republic just seven years earlier, the bank was still negotiating its identity between a state-controlled central bank and a commercial institution, a tension that would remain unresolved for decades. The "Mei" unit itself deserves attention: it was a copper subsidiary denomination used in specific regional markets, not a nationally circulating currency, which sharply limits where these notes actually changed hands.

Pick 57 is among the scarcer entries in the 1919 BOC copper series. Regional redemption practices and the general instability of small-denomination paper in early Republican China meant attrition rates were high.