The Jiading reign period (1208–1224) was one of prolonged military crisis — the Southern Song was locked in an increasingly desperate struggle against Jin Dynasty pressure from the north, and later the first Mongol incursions that would eventually end the dynasty entirely. Iron coinage expanded significantly during this period precisely because copper was being diverted to military hardware and bronze casting. These iron issues circulated heavily in regions where copper coin supply had broken down, and survival in any condition above heavily corroded is genuinely uncommon.
The Jiading reign period (1208–1224) was one of prolonged military crisis — the Southern Song was locked in an increasingly desperate struggle against Jin Dynasty pressure from the north, and later the first Mongol incursions that would eventually end the dynasty entirely. Iron coinage expanded significantly during this period precisely because copper was being diverted to military hardware and bronze casting. These iron issues circulated heavily in regions where copper coin supply had broken down, and survival in any condition above heavily corroded is genuinely uncommon.