Alexander I Balas, Seleukid Kingdom. 152-145 BC. AR Tetradrachm 16.90 g, Antioch or Herakleia mint. Dated SE 164 (149-148 BC). 

Diademed head of Alexander I right.
BASILEWS ALEXANDROY QEOPATOROS EYERGETOY, Zeus seated left, holding Nike and sceptre. 

RAT monogram in right field, date DXR and HARK monogram in exergue. 

BMC 9; Newell SMA 146. 
 
With permission of cngcoins.com, auction 69, Lot 565, June 2005.
SMA attribution corrected.