But I have so many contradictions:

With Medusa head (arms of Logne)

23,6mm, 4gr
De Chestret 21c Var
or S-M20 Var
Dengis 1064
KM# ?
Date??
Stavelot Abbey, Louveigne mint?
This is one of the variaties with legend almost the same on both sides
EPISCO.LEO.MAR.FRANC.COM.LONG.
Thanks for any help