I agree with johnphillip. It's a small, simplified version of a more complex design from the 20's and 30's. Marino Barovier in two different books shows three similar vases, thin glass, ribbed, with tear-shaped applications at the bottom. Two he attributes to Zecchin for Cappelin Venini, 1921-5, and the other to A.VE.M, 1932. I'm not sure if it would possible to attribute this bowl definitively, unless you can locate it in a catalogue. One of the pieces in the books is said to be fumé, which is not quite the same as irridized, is it. The other piece is lightly coloured glass. A very lovely little bowl.
David