Egypt. Alexandria. Julia Mamaea, mother of Severus Alexander, 222-235. Tetradrachm (Billon, 21.8 mm, 12.20 g). Dated RY 13 of Severus Alexander (= 233/4). ΙΟΥ ΜΑΜΑΙΑ ϹΕΒ ΜΗΤΕ ϹΕΒ Κ ϹΤP[Α] Draped bust right, wearing stephane. Rev. Emperor on horseback advancing left, raising hand and holding transverse sceptre surmounted by eagle, in front palm branch; L ΙΓ (date) in upper right field. Dattari-Savio pl. 240, 4454 (this coin). Emmett 3204. RPC VI Online, 10629.9 (this coin). Geissen 2539 (this coin cited). Dark brown patina. Very Fine. Rare. Ex Giovanni Dattari Collection 4454. Ex Naville Numismatics Ltd. 42, 22.07.2018, lot 367. On the reverse of this tetradrachm of Julia Mamaea appears Alexander Severus riding triumphant on horseback to the left, raising his hand in an act of greeting. This is probably a commemoration of the proclaimed victorious end to the conflict in the east, although historically it was of uncertain outcome. Another coin of prestigious Dattarian provenance.