100 Cash - Deyi Yuanbao

The Great Yan State was a rebel polity proclaimed by Shi Siming after he recaptured Luoyang from Tang forces in 759, following the An Lushan Rebellion that had already shattered Tang fiscal infrastructure. The Deyi Yuanbao was issued as political currency in the most literal sense — a declaration of legitimacy pressed in bronze at a moment when two rival courts were simultaneously striking coin.

Shi Siming was assassinated by his own son, Shi Chaoyi, in 761, collapsing the rebellion's momentum entirely. The regime's brief window means surviving examples derive from a narrow production span of roughly two years.