10 Zhu - Wu Zhu, 'Dang Liang'

The 'Dang Liang' (當兩, "worth two") designation on this Wu Zhu reflects an emergency valuation experiment by Emperor Wen of Liu Song, who attempted to address chronic bronze shortages by issuing overvalued coinage — a measure that predictably collapsed under market rejection within years of introduction. The Liu Song court cycled through multiple such revaluations during the 440s, none of which held.

Hartill's attribution places this squarely in the short window before the policy was abandoned, making dateable survivors rarer than the type's modest appearance suggests.