1 Peso Large heading

Mountain Province was one of several Philippine administrative regions that issued its own emergency guerrilla currency after the Japanese occupation disrupted central banking in 1942. These locally produced notes were authorized under the Commonwealth government-in-exile framework and functioned as a practical workaround for communities cut off from Manila's supply of legal tender. The province's rugged terrain — the Cordillera highlands — actually helped sustain a functioning resistance economy longer than lowland areas.

The "Large heading" designation distinguishes this from a later printing variant with a reduced title block, a difference almost certainly caused by a change in the locally available type or printing equipment mid-issue.