1 Cash - Cảnh Hưng Thông Bảo, Seal script, with line

Cảnh Hưng was the longest-reigning era name of the Later Lê Dynasty, nominally attached to emperor Lê Hiển Tông but exercised in practice by the Trịnh lords who had controlled the northern Vietnamese state since the early seventeenth century. The sheer length of the Cảnh Hưng period — over four decades — produced an extraordinary proliferation of cash types, with the seal-script varieties distinguished from the more common clerical-script issues by a stiffer, more formalized rendering of the characters.

The horizontal line on the reverse is a positional marker used to differentiate among the dozens of concurrent types. Toda's cataloguing remains the primary reference, though attributions between closely related varieties are frequently disputed.