This is a pattern piece — KM# Pn102 designates it as a trial or proof-of-concept strike, not a circulating issue. The Banco Central do Brasil conducted extensive testing during the Real plan's preparatory phase in the early 1990s, evaluating multiple planchet configurations before the currency launched in July 1994. The "flat disc" designation distinguishes it from edge-lettered or security-edged variants tested concurrently, suggesting this was one of several competing specifications submitted for the 50 centavos denomination before a final standard was approved.
This is a pattern piece — KM# Pn102 designates it as a trial or proof-of-concept strike, not a circulating issue. The Banco Central do Brasil conducted extensive testing during the Real plan's preparatory phase in the early 1990s, evaluating multiple planchet configurations before the currency launched in July 1994. The "flat disc" designation distinguishes it from edge-lettered or security-edged variants tested concurrently, suggesting this was one of several competing specifications submitted for the 50 centavos denomination before a final standard was approved.