10 Centavos Green underprint

Negros Occidental was one of several Philippine provinces that issued emergency guerrilla currency after Japanese forces occupied the archipelago in early 1942, cutting off the supply of Commonwealth and US-backed notes. The provincial government organized local printing to maintain a functioning wartime economy — no small task with materials stripped down to whatever paper and ink the island could source or stockpile.

Nalco Press was a local commercial printer, not a security printer. The green underprint on this series was a rudimentary anti-counterfeiting measure, but forgery by both Japanese-aligned and opportunistic local actors was a persistent problem across all Philippine emergency issues.