LXXX Reais 'Real Português Dobrado' - João III Single cross, Lisbon

João III issued this denomination during the final years of his reign, a period when Portugal's Atlantic empire was straining the domestic treasury rather than filling it — chronic overextension in Brazil, Africa, and Asia had begun reversing the flow of silver almost as fast as it arrived. The 80 Reais piece occupied an awkward middle tier in a currency system that would be substantially reorganized under Sebastião within a decade.

The Gomes references J3 93 and J3 94 distinguish two die variants of this Lisbon striking, a distinction that matters to specialists working the series closely.