Hi David,
I agree with Laura in the date, probably 70's, and Italian.
I cant say for sure if it is Fratelli, as the ones I have seen in Cobalt/Dark Amethyst are much thicker pieces. This one looks pretty thin, and the murrines/canes are not as sharp (as far as the look of them) as the Toso pieces. I have seen other bowls like yours in solid colors with the common Venetian Glass labels, but not with any labels by Fratelli Toso.
Javier