100 Yuan Farmer's Bank of Northwest China

The Farmer's Bank of Northwest China was a communist-controlled regional bank operating in the Shaan-Gan-Ning Border Region — the Yan'an base area governed by the Chinese Communist Party during the Second Sino-Japanese War. It issued its own currency as a deliberate economic weapon: notes circulated within the border region were used to displace Nationalist fabi and stabilize CCP-controlled territory against both Japanese military scrip and Chongqing's inflation pressure.

The S-prefix Pick reference places this firmly in the Chinese provincial and local issues, and the "Dd" suffix denotes a specific signature or plate variety within the 1943 100-yuan denomination — a high face value reflecting the inflationary pressures of wartime. By 1948, the border region currency was absorbed into the new Renminbi system and existing notes were retired.