Through my research, this is believed to be Fenton, although there is only one little mark on the bottom (see pic).
Vintage Fenton Blue Opalescent Basket Weave Open Edge Handle Basket
Fenton Cobalt Blue Miniature Basket MINT in Box
Fenton Colonial Blue Thumbprint Basket Bowl 6" Vintage Glass
Vintage Fenton Cobalt Blue Hobnail Glass Basket Ruffled Edge 6” Handle
Fenton Glass Open Edge Iridescent Basket Weave Blackberry Carnival Glass Dish
FENTON ? BLUE OPALESCENT BASKET WEAVE BASKET w RETICULATED RUFFLE EDGE 6 And 1/2
