PORTUGAL, Kingdom. Sebastião I o Desejado (the Desired). 1557-1578. AV Meio São Vicente – 500 Réis (25mm, 3.78 g, 10h). Porto mint. Struck 1557-1559. Crowned coat-of-arms; P O flanking / St. Vincent standing right, holding palm frond and model of ship. Gomes –; Vaz –; Friedberg –. VF. Extremely rare issue for this mint.