I believe that this is this medal is an unofficial version and that the Corée-Korea bar was not authorised. The EENDRACHT MAAKT MACHT (along the top) L'UNION FAIT LA FORCE (along the bottom) legend and lions of both sides, means that it was issued from 1952 (?) though I'd be grateful if someone could confirm this. Also, I'm afraid that I don't know whether this is the 'good service' or the 'gallantry' type - the chevron is correct for the former, the ribbon for the latter, which type is it - or is it both?
You are right in assuming the Corée-Korea bar is not authorised for this medal. The ribbon is indeed the Art.4 (gallantry) type and the chevron denotes the 1st class of this medal. For it to be a Korean War award, it officially would have to have a silver palm with the royal cypher "L" on its ribbon.The reverse centre would have no royal cypher but the same climbing lion as on the obverse.
The bilingual motto on the medal was made official on 24 October 1951 but manufacturers did have unilingual medal stocks which they would have wanted to get rid off before producing the bilingual model ...
Regards,
Hendrik