Gordian III, AE30 of Iconium, Lycaonia. AD 238-244. 

IMP CAE M ANT GORDIANVS AVG, laureate, draped, and 
cuirassed bust right.
COL AEL HAD ICONIHS, Emperor on horseback, galloping
right, riding down an enemy on ground, wearing Phrygian
helmet. SR harpa (the sickle weapon) of Perseus in ex. 

Not in Mionnet, von Aulock, SNG Cop, BMC etc. 
Apparently unique and unpublished. 

Roma Numismatics, auction March 2012, lot 521
With permission of Roma Numismatics, March, 2012