This looks like avventurina decoration on a Murano vase.
This glass found its biggest application in Murano in the mid-nineteenth century, first at the furnaces of Pietro Bigaglia and then at Salviati & C., where it was melted once again and blown to obtain extremely rich items, often made for the royal family. In the twentieth century avventurina was used by only a small number of glass-works as it was very difficult to obtain. Special mention should be made here of Barovier & Toso and Aureliano Toso who, on the designs of the painter Dino Martins executed a series of vases with this material
(Franco Deboni - Murano 900 pp339)
Avventurina is the given name for a form of decoration, Nason used the name for their wares but it was also used by other factories. This could be a small piece by Martins – not ‘Oriente’, ‘Eldorado’ or ‘Zanfirici’ but a small one off piece, the highly coloured red and green with the avventurina look like some smaller bits he did – see Murano 900, or Dino Martins book.
Just a suggestion
Thanks
Adam P