20 Yuan · Dagiang Yinhang Pre-1949 Communist Bank

The Dagiang Bank (大江银行) was a regional Communist financial institution operating in the Liberated Areas of central China during the final years of the Second Sino-Japanese War. These guerrilla-zone banks issued their own currency partly to fund military operations and partly to displace Japanese-sponsored puppet currency — the act of issuing notes was itself a political and logistical weapon.

The security overprint on this series was added as a basic anti-counterfeiting measure against Japanese forgery operations, which actively targeted Communist-issued paper to destabilize local economies. Pick S3710 is not a common survivor; wartime paper quality was poor, and most notes in circulation were destroyed through use or deliberate withdrawal after Liberation.