An interesting variation
BITHYNIA and PONTUS, Nicaea, AE23 (22mm, 5.82g, 12h).
ΑΥΤ ΔΟΜΙΤΙΑΝΟΣ ΚΑΙΣΑΡ ΣΕΒ ΓΕΡ, head radiate right; ΝΕΙΚΑΙΕΙΣ ΠΡΩΤΟΙ ΤΗΣ ΕΠΑΡΧΕΙΑΣ, garlanded and lighted altar inscribed ΔΙΟΣ ΛΙΤΑΙΟΥ.
RPC 644 var, radiate.
This coin, besides being an unpublished radiate variety (just as RPC 643 in relation to RPC 642), confirms the altar inscription which RPC leaves in doubt.