A long standing problem.
Some examples have "OEm-nouel" (or something like that) on the
obverse, and others don't.
Lianta seems to list both
types as
SBCV 2110 of
John III.
Lianta reads the ruler as (I)W/D/C on one example, but I wouldn't take this as certain.
I have never seen examples of either
type where the ruler's name is really clear, so I don't know for sure to whom the two
types should be assigned.
This is a problem that only further data can solve.
Ross G.