Vintage Murano Attributed Mid-Century Modern Silver Leaf Glass Frog - Rare & Mint - I have never seen one like this in silver before! The design is similar to V Nason, but with a slightly larger lip. That leads me to strongly believe this beautiful sparkling frog was by Franco Bottaro. It is unmarked, but I base all of my attribution opinions on research that I do with the help of multiple Murano collectors groups online. He is in beautiful condition and quite large, weighing in at 2.6# and measuring 4.5"H x 5"L x 5"W