If and when I will make a correction, I'd like to make it here so others can correct/adjust their records as well.

CG48557 (a 5) under INTERNATIONAL SPORTING CLUB is actually a MONACO 5[F] jeton listed in French catalog and a few pricelists through the years.

Note that the London club pieces read INTERNATIONAL SPORTING CLUB where the illustrated MONACO piece reads SPORTING CLUB INTERNATIONAL -- as does an oval 500Frf plaque from the casino with the "SCI" monogram and other jetons with the monogram..