LXXX Reais 'Real Português Dobrado' - João III Cross with stars, Lisbon

The "Real Português Dobrado" denomination was introduced under João III as part of a broader recalibration of Portuguese silver coinage during the mid-sixteenth century, a period when Atlantic trade revenues were reshaping royal finances faster than the existing monetary system could accommodate. Lisbon, not Évora or Porto, handled the bulk of this production — proximity to the Casa dos Contos and the flow of colonial silver made it the logical anchor for new issues.

The Gomes reference places this squarely within a two-year window, suggesting a short-lived emission rather than a sustained type.