Province Bithynia-Pontus
City Nicaea 
Region Bithynia
Reign Severus Alexander
Obverse inscription ΙΟΥΛΙΑ ΜΑΜΑΙΑ ΑΥΓ (or ΑΥΓ)
Obverse design diademed and draped bust of Julia Mamaea, r.
Reverse inscription ΝΙΚΑΙΕΩΝ (or ΝΙΚΑΙΕΩΝ)
Reverse design three military standards, topped by wreaths

 

Reference Bertolami Fine Arts - ACR Auctions E-36, 24 Sept. 2016, lot 767
Diameter 20
Weight 4.64
Axis 1
External URI of the coin http://pro.coinarchives.com/a/lotviewer.php?LotID=919336&AucID=1758&Lot=767 
Note