1 Cash - Khai Thái Nguyên Bảo, Regular script

The Trần dynasty maintained a cash coinage system borrowed structurally from Chinese precedent, but the reign of Trần Minh Tông — under whose rule this piece was struck — coincided with a period of careful reconstruction following the devastating Mongol invasions of the late 13th century. Three separate Yuan dynasty incursions between 1258 and 1288 had disrupted Vietnamese economic infrastructure severely enough that stable copper coinage in the early 14th century carried genuine administrative weight.

Barker 17.1 is the regular-script variant; a cursive-script type exists for the same reign title, and distinguishing the two requires close attention to the character forms rather than any difference in physical specification.