1 Cash - Gia Long Thông Bảo, with crescent

Gia Long, born Nguyễn Ánh, reunified Vietnam in 1802 after nearly three decades of warfare against the Tây Sơn dynasty — a campaign that required French Missionary support, years of exile, and the recapture of Saigon before Huế finally fell. The cash coinage issued under his reign drew directly from the Chinese square-holed tradition his dynasty had long operated within, with the crescent privy mark on this variety distinguishing mint batches in a system designed to track output across multiple furnaces.

Barker 99.9 places this among the more elusive crescent-marked pieces of the reign.