1000 Cash Yongan, large type, iron

You Zhou (modern Beijing and its surroundings) operated as a semi-independent military governorate under the Liang and Tang successor states during this period, and its coinage reflects that autonomy — iron rather than bronze signals both a shortage of copper and a deliberate assertion of local monetary authority separate from the collapsing Tang fiscal system. The You Zhou iron cash series is notably heavy and coarsely cast compared to contemporary southern issues, consistent with a frontier mint working under logistical constraints rather than court supervision.