MESOPOTAMIA, n/a. Nisibis. Severus Alexander. AD 222-235. Æ (26mm, 10.70 g, 6h). Laureate bust of Severus Alexander right, slight drapery / Veiled and draped bust of Tyche right, wearing mural crown; above, ram leaping right; stars to left and right. BMC 5; SNG Copenhagen 235. Earthen dark green patina. .