1 Peso Emilio Aguinaldo, Reverse Trial

Trial pieces for the Bangko Sentral ng Pilipinas were produced ahead of the major coinage reform that reorganized Philippine circulating denominations in the late 1960s. This reverse trial — struck in brass rather than the copper-nickel ultimately adopted — represents one stage in the material testing process, where the mint evaluated how different alloys rendered the die detail and wore under simulated handling conditions. Brass was a serious candidate given its cost relative to nickel alloys and its established use in regional coinage.

Aguinaldo died in 1964, just five years before this trial was struck.