2 Cash - Jiatai Tongbao, Chun, iron

The Jiatai reign (1201–1204) fell during the Southern Song's prolonged standoff with the Jin dynasty, a period when copper shortages drove the court to authorize large-scale iron cash production. Iron coinage was always a second-best solution — prone to corrosion, rejected by merchants when alternatives existed, and chronically overproduced relative to actual demand. The "Chun" mint designation indicates production at Chun Prefecture in modern Hunan, one of several provincial facilities pressed into service to meet the wartime fiscal shortfall.

Survivors in collectible condition are genuinely scarce. Iron cash corroded in hoards far more aggressively than bronze, and much of what circulated was eventually melted or simply disintegrated in the ground.