1 Cash - Khai Thái Nguyên Bảo, Clerical script

Khai Thái was the reign era of Trần Minh Tông, the fifth emperor of the Trần dynasty, whose court maintained strict Confucian administrative structures borrowed heavily from Song Chinese precedent — including the practice of issuing new cash coinage to mark each reign period. The clerical script designation here distinguishes this emission from parallel issues in standard script, a distinction the Trần court made deliberately to differentiate administrative and ceremonial contexts.

Barker's attribution to this narrow five-year window relies on reign-era correlation rather than mint documentation, as Vietnamese cash of this period carry no mint marks.