This
type was not minted for M.
Aurelius, and the Commodus/Abgar coins are smaller in module. This coin is certainly of S.Severus, of the subtype without the
scepter in front of Abgar's
portrait,
BMC 31.
The legends of these coins are particularly crude and vary greatly - sometimes all A's, V's and lambda's are
engraved as 'V', which complicates the reading. The legends are almost always to be interpreted as 'Severus Autokrator' and 'Abgaros Basileus'.
All the Edessan kings of that name are just called 'King Abgar' on their coins. Only very rarely is there some kind of differentiation in the legends, for example a coin of Abgar
VIII (the one on your coin) has the name 'Septimius' included in the
legend, and a coin of
Caracalla has an Abgar called 'Abgar Severus'.
Regards
Gert