Francesco -- TxSilver again. I had answered this on another board, but I'll answer again here. The signature on bottom is not real. It looks like it was made with a diamond point pen. The glass is too shiny and bright for Martinuzzi. Martinuzzi used paste glass for the pulegoso pieces he designed for Venini. (This is something I learned recently from one of our members.) It made the glass very opaque and not so shiny as this. What I suspect for your vase, Francesco, is that it is a reproduction, perhaps made in Murano. Many of the classic pieces are being reproduced on the island. We see a good many of them being sold from Venice on eBay. Most have quality that is not so good.
I thought perhaps the vase could have been done by Venini in a different type of glass, but the surface, signature, and base make me think that it is simply a vase made to look like Martinuzzi's. These details do not fit the work coming from Venini. I do like the handles on your vase, though.
I could be wrong and would love it if I am. All arguments are welcome.