Gordian III and Abgar, AE of Edessa, Mesopotamia.

AVTOK K M ANT GORDIANOC CEB, laureate, draped bust right. 
C ABGAROC BACILEVC, Gordian III, draped, standing right, 
holding globe in one hand and mappa in the other; before him, Abgar standing left, wearing diademed tiara, holding wreath.
 
BMC 140.

From JNG XIX, 1969.