100 Đồng

The National Bank of Vietnam's reliance on Thomas De La Rue for this series reflected a practical reality: the Republic of Vietnam lacked domestic high-security printing capacity throughout its existence, and London remained the consistent supplier for its higher-denomination notes well into the early 1970s. By 1972, the war had produced chronic inflationary pressure — the 100 Đồng note, once a meaningful sum, was losing purchasing power faster than new stock could reach circulation.

P#31 is the final redesign of this denomination before the post-Paris Agreement economic collapse accelerated currency debasement sharply through 1973–74.