20 Pesos

The Negros Emergency Currency Board was one of several provincial bodies authorized to issue guerrilla currency after the Japanese occupation severed the islands from centralized banking. Negros Occidental in particular maintained an unusually organized resistance administration, and its emergency notes were treated as legitimate tender within liberated or contested zones — not simply as scrip. Montelibano, who served as provincial governor, signed as chairman, lending the issues a degree of civil authority that many other guerrilla series lacked.

The S664 series is among the more frequently encountered Negros issues, though pieces showing all three countersignatures clearly intact are harder to find than raw survival numbers suggest.