RIC does not list this bust type (Q) with this obverse legend (1g). It should come after London 229. It is not in Huevelin either.
Constantine I
A.D. 310-12
22mm 4gm
CONSTANTINVS AVG; bust left, laureate and cuirassed, holding eagle-tipped sceptre.
PRINCIPI IVVENTVTIS [In honor of the Prince of Youth]; Prince standing facing, head left, holding a globe and spear, star in right field.
in exergue PLN
RIC VI London --
It sold for $644.00