25 000 Customs Gold Units

The Customs Gold Unit was introduced in February 1948 as a nominally gold-backed accounting currency for tariff collection, an attempt to insulate customs revenue from the hyperinflation that was already destroying the Gold Yuan and its predecessors. It didn't work. By the time denominations this large were necessary, the entire system had collapsed in function if not yet in name.

The Central Engraving and Printing Plant in Shanghai was under severe operational pressure in 1948 — the facility would fall to Communist forces the following year, and much of its equipment and staff relocated to Taiwan.