1000 Piso With horizontal bars

The "horizontal bars" designation distinguishes this from the standard 1000 Piso issue of the same period — a term used by collectors to identify a specific security feature variant rather than a separate emission. The BSP's Security Plant Complex has printed Philippine currency in-house since 1978, one of relatively few central banks in Southeast Asia to maintain full domestic production rather than outsourcing to specialist printers like De La Rue or Giesecke+Devrient.

The 80/20 cotton-abacá blend is distinctive: abacá, a Philippine-native plant fiber, has been incorporated into the substrate partly as a matter of national resource policy. Whether it meaningfully improves durability over pure cotton paper remains debated among printers.