Julia Mamaea was the daughter of Julia Maesa and mother of Severus Alexander. This fine, large sestertius shows Julia Mamaea on the obverse with the inscription IVLIA MAMA - EA AVGVSTA.
The reverse shows Felicitas standing left with legs crossed and leaning on a column, holding a caduceus in her right hand. The reverse legend reads FELICITAS PVBLICA SC.
This coin is shown in Roman Imperial Coinage IV, Pt 2, p 125, No 676.