1 Peso

The Negros Emergency Currency Board was one of several provincial and municipal bodies that issued guerrilla currency in the Philippines during the Japanese occupation. These notes were produced to keep the resistance economy functioning after the Philippine Commonwealth peso was disrupted — and to deny the Japanese Military Administration's peso any further traction in the interior. Negros Occidental had enough organizational capacity and sugar-industry infrastructure to sustain a functioning parallel economy for much of the occupation.

S661 notes are among the more frequently encountered Negros issues, but wartime paper and improvised storage conditions mean genuinely sound examples are harder to find than raw survival numbers suggest.