Egypt, Alexandria. Julia Mamaea, mother of Severus Alexander 222-235. Tetradrachm (Billon, 23.62 mm, 13.96 g). Dated RY 7 = AD 227/8. IOY MAMЄA CЄ BA MHT P Draped bust of Julia Mamaea, wearing Stephane, right. Rev. Conjoined draped busts of Helios, wearing radiate crown, and Selene; set within crescent, to right; L Z (date) in left field. Geissen 2510. Dattari-Savio 4486 (this specimen). K&G 64.22. Emmett 3206. (5). BMC 1727. Extremely rare type for this regnal year. Very Fine. Ex Giovanni Dattari Collection, Il Cairo. Ex Giuseppe Nascia, Milano and ex Athos Moretti Collection, Bellinzona. Specimen purchased in May 1987. Exceptionally rare tetradrachm of Julia Mamaea, notable for its pleasing style, both in the portrait of the Augusta on the obverse and in the harmonious depiction of the complementary youthful deities Helios and Selene. Its provenance from the Giovanni Dattari collection further guarantees the prestige of this coin.