Festival of Isis under Constantine II
316 to 337 AD
AE 4
Obvs: DN CONSTANTINVS PF AVG, Constantine facing right diademed, draped and cuiraissed.
Revs: VOTA PVBLICA, Isis standing facing, looking left, holding sistrum and situla.
16mm, 4.5g. (This coin is very large for an AE4, measururing 3mm thick)
Rome mint
Not listed in RIC
Reference: Vagi #3438
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 Contributed by David Kalina, Poseidon Coin Company.