In a response to the same question on the
German Numismatikforum, I pointed out
(a) that the unclear date is likely to be ET E = Year 5 = 196/7 AD, since this is the only year recorded for drachms of
Caracalla Caesar at
Caesarea in Sydenham/Malloy, Coinage of
Caesarea in
Cappadocia,
(b) that the longest recorded
obv. legend for this
drachm is
MAR AVRHLIOC ANTWNI KAI,
Sydenham/Malloy 466a = SNG v. Aulock 6484, that is the same
legend as on antoninus1's coin, but with ANTWNI not ANTWNINOC.
"Eine etwas längere Legende bei Sydenham/Malloy 466a = SNG v. Aulock 6484,
"MAR AVRHLIOC ANTWNI KAI.
"Das Datum wird ET E = 196/7 n. Chr. sein, weil Silbermünzen von
Caracalla als
Caesar aus
Caesarea nur aus diesem Jahr bekannt sind."