Severus Alexander as Caesar. 221-222 AD. AE 33, 21.13g. Pamphylia, Aspendos. 

Obv: Bare-headed, cuirassed bust right, seen from front, 
drapery on far shoulder, Medusa head on breast of cuirass.
Rev: ACPENDIWN, Triform Hekate standing, wearing kalathos on 
each of her three heads, holding a patera, two torches, and 
three other uncertain objects in her six hands; below, two 
hounds spring left and right below. 
 
Apparently unpublished for Severus Alexander as Caesar: not 
in BMC, SNG von Aulock, SNG Cop, Mionnet, four works on 
Greek coins by Imhoof-Blumer, Lindgren, Kraft's System etc. 
Cf. SNG von Aulock 4591 for Julia Soaemias, same reverse die. Good Fine.
Ex Dr. Stephen Gerson Collection.

Gemini Numismatic Auction #6, January 10, 2010, lot 644