1/2 Decimo Copper Pattern

Chile's decimal coinage reform was enacted in 1851, replacing the real-based colonial system with pesos and décimos. These copper pattern pieces were struck as part of the evaluation process before the new denominations entered production — the circulating coinage that followed was issued in silver, making a copper half décimo something that never reached the public in any intended form.

Pattern survivorship from mid-nineteenth-century Chilean issues is poorly documented, and attribution to specific striking facilities remains contested.