Is this a King Leopold ll Belgium coin?

Hello
I have this coin(?) and I would love to know what it is and how old as I cant find any other images online.
It is the head and shoulders of King Leopold ll ROI facing left and on the reverse I can see the words for inauguration but the date is erroded.
It is 5cms and copper I think,
any help would be appreciated
thank you :)

LEOPOLD II ROI DES BELGES

then ... strange

(Exposition publique) DES MACHINS ET ... (objets (objects)? grues (cranes)?)

in a circle:
DE L'ETAT BELGE
SECT DE MONS
INAUGURATION
DU...(dragage? = Dredging of canals?)

1906?

"MACHIN" is literaly translated by widget, gizmo, thingy ... therefore rather pejorative.
it's undoubtly "DES MACHINES". When the engraver saw that it was missing the "S" of the plural, he overstamped the "S" on the "E" of MACHINE.

So an inauguration of an exhibition of machines of the belgian state ?
Where they sort of Earthmoving machines ?

SECT DE MONS might be "sections" of Mons.
In Belgium, a "section of commune" is a former civil township, now merged.
Mons gets 19 sections : Mons, Ghlin, Flénu, Jemappes, Maisières, Nimy, Havré, Harmignies, Harveng, Hyon, Mesvin, Nouvelles, Ciply, Saint-Symphorien, Villers-Saint-Ghislain, Spiennes, Cuesmes, Obourg, Saint-Denis

Please send the pictures to Marc, he has made a complete inventory of all belgian medals, tokens and jetons.
He propably can help you
marc.willemans@telenet.be

Please keep us informed ... Thanks

Thanks frenchlover that's really helpful and you can see much more than me! I took a rubbing which shows more but still confusing.

PetrusAscanus I will send a message - thank you for the contact.

watch this space.....

thanks again :)