Handmade bubble glass vase

This beautiful blown glass vase with multiple bubbles is reminiscent of the productions of the famous biot glassworks, but since the pieces from it are all signed (the glassworks confirmed this to me), it must come from another craft workshop. I am quite surprised that it is not signed given its quality. Its deliberately asymmetrical shape, the many fine bubbles included in the glass, the quality of the finishes (very smooth, non-cutting edge, very clean, very smooth base) are evidence of beautiful craftsmanship. Its color is a plum purple. It would date from the 70s or 80s according to its former owner. It is in very good condition, no cracks, no chips, one or two micro-scratches when examined very closely under bright light, otherwise totally invisible. It measures 20 cm in maximum height, approximately 14 cm in width, 9 cm in maximum thickness.