This signed Gabriel Argy-Rousseau pate-de-verre lotus or loving cup, with blue and purple staining, is guided at $3000-5000 in the September 22 sale at Fontaine’s Auction Gallery of Pittsfield, Massachusetts. The 4in (10cm) cup is accompanied by a certificate of authenticity from Cento Anni Antiques of Brussels, Belgium.
fontainesauction.com