1 Cash - Gia Long Thông Bảo, small size

Gia Long was the reign title adopted by Nguyễn Ánh after reunifying Vietnam in 1802 following nearly three decades of conflict with the Tây Sơn dynasty — a struggle that had forced him into exile and into a controversial alliance with French missionaries and mercenaries. The cash coinage issued under his name was among the first struck by a centralized Vietnamese imperial administration controlling the full length of the country, from the northern border down through the Mekong Delta.

The small-size variant distinguished in Barker 99.1 reflects the mint's inconsistent output across nearly two decades of production at multiple provincial furnaces.