Hi: Nice piece, and worth taking a chance on, I think, if you bought it for a reasonable price on eBay. I don't think it's Venini--it would very likely have been signed--, but the title of the photographs give another starting point: Dino Martens for Aureliano Toso. The filigree is very similar to what Martens used: white and another colour edged with bronze. The bowl bears some resemblance to Model 5267 on p.156 of the Martens book by Marc Heiremans. My concern would be that the shape is too regular, and I'm not sure Martens used that red. Other people on the GMB know Martens work far better than I do; hopefully, somebody will be able to give you a more precise answer. Definitely worth further investigation.