Thank you for your help.
Based on your informations i found on internet the following data
WW2 Commemorative Medal of the Armed Partisans of the
Independence Front (Patriotic Militia) Resistance Group, 1941 - 1961.
The medal was issued to the surviving veterans of the Group, in 1961
to commemorate the 20th Anniversary of its foundation, in 1941.
On the reverse the initials: F.I. - O.F. and P.A. - M.P. (for Independence
Front and Armed Partisans in French and Flemish respectively)
The Group was founded in 1941 and engaged in Resistance acts
against the Germans in the occupied Belgium. In 1944 it was renamed
to "Patriotic Militia".
If someone is intrestead on the medal please feel free to contact me.