1 Piso Reverse Trial

Trial pieces issued by the Central Bank of the Philippines in this period predate the formal 1967 coinage reform, which replaced the old centavo-based English series with a new Pilipino series denominated in piso and sentimo. This particular brass reverse trial would have been produced to test design viability before committing to a production composition — the eventual circulating 1 Piso was struck in copper-nickel-zinc, making brass trials anomalous by material alone.

Pattern and trial coinage from the Philippine Mint during this transitional window is sparsely documented. KM# Pn11 represents one of several experimental strikings whose survival numbers remain unconfirmed in the standard references.