Thanks, though not sure if that is it (for reverse) - I found this ...
which has the Sun at the top, and large letters at the base.
Though yours has ? ? W letters on it, and not M G I letters.
On the obverse maybe like you say LVD XV D G ET N REX
Just also found this, which does have the three letters different (but not the same),
and also does show two letters RE PF either side of the base of a tree (with Sun above),
and yours
also does seem to have some letters either side above the line ...
With RE PF meaning Rechenpfennig it is one of those made in Nuremberg for use in France.
Anyway, here is
maybe what some of the letters are ...