According to a VNBusinessNews.com article dated 02.12.2009, Nguyen Ngoc Bao, the director of the Monetary Policy Department, has denied rumors that the State Bank of Vietnam plans to issue 1,000,000-dong (US$54) banknotes. At present the largest denomination in Vietnam is the polymer 500,000-dong note (B348, shown above).
Courtesy of Thomas Krause.