Light Blue OPALESCENT Bowl- Drapery Design- Who Made This?

I had given this bowl to a Charity Auction over 15 years ago and today the winner of the auction bid at the time, offered it back to me. I didn't know anything about it then and I still don't today. It measures 12" across and has a light blue Opalescent color with a drapery/honeycomb design. It is unmarked and has a flat polished base. Thanks everyone for any help you may provide. RER (LOUMANAL)