Hmmmm....
Now I am a little bit confused. Of course I saw the MOP jeton at John's website before.
But for me, John's "CN" is very similar to my "CN". OK, it is not 100 % the same, but very (!) close.
Of course that does not prove that my plaque is from Namur, but I think that it still could be. At the moment, I have no better guess.
Look, I cut it out of his site:

Regards,
Björn Zabel