1 Fen Meng Chiang Bank

The Meng Chiang Bank was established in 1937 to serve the Japanese puppet administration of Inner Mongolia — formally the Mongolian Military Government — and its currency was designed to displace both Nationalist and existing regional issues from circulation. By 1943, raw material shortages across the Japanese empire had forced a broad shift to aluminium for small-denomination coinage, the same constraint driving parallel changes in Manchukuo and occupied Southeast Asia.

The Y#Pn1 designation flags this as a pattern rather than a confirmed circulation strike, which leaves its production numbers genuinely unclear.