Yes most of the foreign sparklers I have, came from France, when that lady went to France, she bought several times these kind of marbles there at fleamarkets and antique stores and sold them to me, the AJAX marble also comes from France. There's one thing she didn't want to sell to me and that's an original bag with these kind of marbles, she showed me that ones and told me that maybe ones she would sell it to me, but not now. I'm still waiting, but I don't want to push, because she also sells me other marbles like handmades etc.
If they are made in France: I don't know, but in Marble Mania, edited by Stanley Block, is written on page 153 that indeed some of these marbles would be made in France and packed in bars of soap, for example they name a marble with BONUX on it, Bonux is a French soap.
Cees.