This 2.5" medal is from the Exposition Universelle et Internationale, the world's fair held in Brussels in 1910. Specifically, this medal is from 

Exposition Collective Des Charbonnages De Belgique / Bruxelles

Which, according to Google Translate, is 

Collective Exhibition of Coal Mines From Belgium / Brussels

The engraver is G. Dom and the foundry was Fonson & Co, whose name is on the bottom center of the reverse.

Beneath the G in Charbonnages, there is a sort of squiggly mark. Looking at the two pictures provided you'll notice that the mark isn't visible. Hold the medal on an angle so the light reflects off of it and the mark is readily visible. This might just wipe off easily, I don't know as I know enough not to clean a medal.

If there's a flaw, or flaws, with the medal we're doing our best to explain it and show it. While a flaw (or flaws) may not be mentioned in the text description, it (they) will surely be visible in the photos. Make sure to see all the photos that ebay shows at the top of the auction.

Please do not hesitate to ask questions or to request better pics of something in particular.

Shipping will be USPS First Class. It will be in a zip bag in the package as an extra precaution from the elements.