12 Vinténs - Maria I and Pedro III

Maria I ruled jointly with her uncle-husband Pedro III from her accession in 1777 until his death in 1786, a constitutional arrangement that gave Pedro nominal co-sovereignty despite wielding little actual power. The 12 vintén denomination — equal to 240 réis — was a workhorse of domestic silver commerce during a period when Portugal was attempting to rationalize a currency system still cluttered with medieval fractional units. The joint reign coinage was struck at Lisbon and covers two die varieties catalogued separately by Gomes as MP 15 and MP 16, distinguished primarily by minor differences in the royal titulature arrangement.