EGYPT, Alexandria. Julia Mamaea. Augusta, AD 222-235. Potin Tetradrachm (24mm, 11.62 g, 12h). Dated RY 10 of Severus Alexander (AD 230/231). Draped bust right, wearing stephane / ΠЄΡΙ/ΟΔΟС/ΔЄΚΑ/Τ Η in four lines across field; all within wreath. Köln 2512; Dattari (Savio) 4534 & 10088; K&G 64.37; Emmett 3233.10 (R3–. Good VF, dark brown patina with touches of red. Very rare, only another coin in CoinArchives. This reverse type commemorates the Decennalia of Severus Alexander.