This coin is not in RIC for this bust type. The exergue looks like •PTR; but might be •PTR• … neither are in RIC. If it is •PTR•, it is in Alten and Zschucke as 112; but if it is •PTR, it is not listed there either.
Constantine II
A.D. 321- 323
20mm 2.8gm
CONSTANTINVS IVN NOB C; laureate and cuirassed bust right, holding victory on globe in left hand and spear over right shoulder.
BEATA TRANQVILLITAS; globe set on altar inscribed VO/TIS/XX; above, three stars.
In ex. •PTR
RIC VII Trier ---