1 Lang - Gia Long

Gia Long, born Nguyễn Ánh, unified Vietnam in 1802 after decades of civil war against the Tây Sơn dynasty, establishing the Nguyễn imperial line and naming the new state Vietnam — a name the Qing court initially refused to recognize. The lang was the foundational silver denomination of his new monetary order, its weight standard derived loosely from Chinese precedents but adapted to local commerce. Production was handled by the Board of Revenue mint in Huế, the newly designated imperial capital.

Surviving examples show considerable variation in flan preparation, a direct consequence of hand-casting rather than mechanical striking.