Pedro IV's reign over Portugal lasted roughly two months in 1826 before he abdicated in favor of his daughter Maria, making this one of the shortest-reigned monarchs to appear on Portuguese coinage. The peça denomination — equivalent to 6,400 réis — was the prestige gold issue of the Portuguese monetary system, and pieces struck under Pedro carry that abdication window as a hard date boundary. The 1828 terminus reflects continued striking under his nominal authority during the regency crisis, before Miguel I seized power and declared himself absolute king.
Pedro IV's reign over Portugal lasted roughly two months in 1826 before he abdicated in favor of his daughter Maria, making this one of the shortest-reigned monarchs to appear on Portuguese coinage. The peça denomination — equivalent to 6,400 réis — was the prestige gold issue of the Portuguese monetary system, and pieces struck under Pedro carry that abdication window as a hard date boundary. The 1828 terminus reflects continued striking under his nominal authority during the regency crisis, before Miguel I seized power and declared himself absolute king.