Nguyen Phong Thong Bao ("Universal coin of Nguyen Phong") / Blank. 21mm, 1.87 grams. Cast 1251-1258 during the Nguyen Phong period. Toda 17; Barker 13.1-13.2.

The attributions are based on Toda's attributions. It is possible the coins were cast in the 1300's-1500's by various Vietnamese warlords.

Thai Tong (reigned 1225–1258) was the second emperor of the Trần dynasty in Vietnam, succeeding his father Trần Thái Tông. His personal name was Trần Cảnh, and he is often remembered for consolidating the rule of the Trần family after they replaced the Lý dynasty. Thai Tong continued the administrative and military reforms begun under his father, strengthening the central authority and defending Đại Việt (medieval Vietnam) against external threats, particularly from Champa in the south. His reign was marked by relative stability, prosperity, and cultural development. He abdicated in favor of his son, Trần Thánh Tông, but remained influential as Retired Emperor (Thái Thượng Hoàng), a common practice among Vietnamese monarchs of the period.