Severus Alexander, AE21 of Caesarea, Cappadocia. AD 222-235.  5.68 g. Dated Year 6, AD 227-228.

AY K CEOYH ALEXAND, laureate head right.
MHTRO KAICA around, ET digamma below, emperor on horseback 
galloping right, holding spear and raising right hand. 

BMC 320; Sydenham 573. 

With permission of cngcoins.com, auction 352, Lot 343, June 2015.