Dear SVAPR,
The frontside shows: " Mouvement National Royaliste" (MNR) which is a Belgian WWII resistance group, active in Brussels area and Flanders. It's dutch name was Nationale Koningsgezinde Beweging or NKB. This is a non wearable commemoration medal given by the veteran association. I know the NKB/MNR had at least 7 wearable medals, I never saw this one. Frontside and revers shows also "Brigade De Zuen". This must be a subdivision of the NKB/MNR. I don't find info about that group, sorry. I hope someone else does.
Kind regards from Belgium,
jef