Julia Mamaea, AE24 of Dium, Macedonia. AD 222-235. 10.81 g. 

IOVLIA MAMAEA AVG, diademed and draped bust right.
COL IVL DIENSIS, Athena standing left, holding patera 
and spear, serpent at foot to left and right. D-D (retrograde across fields.

Kremydi 12; Varbanov 3510.

With permission of cngcoins.com, auction 349, Lot 218, April 2015.