Koinon of Macedonia, AE27, AD 238–244. 11.94 g. 

ALEXANDR-OY, Diademed head of Alexander right with long hair.
KOINON MAKEDONWN B NE-W, Alexander standing right, taming
Bucephalos, holding the horse's reins with both hands. 

AMNG III-I 556; Imhoof 40 in ZfN XXV (this coin). 

Courtesy of the Staatliche Museen zu Berlin, Münzkabinett.