Nguyên Hựu Thông Bảo

Issued under Emperor Trần Minh Tông, whose reign saw the Trần dynasty stabilizing after the catastrophic Mongol invasions of the late thirteenth century had disrupted Vietnamese trade and coinage production entirely. The cash coin format followed Chinese precedent closely, as Vietnamese rulers consistently modeled their currency systems on Song and Yuan prototypes while maintaining distinct reign titles.

At 1.7g, these struck light even by Vietnamese cash standards of the period — likely reflecting copper supply constraints rather than debasement policy.