Unique vase by Vicke Lindstrand. It has all the characteristics: the deep sommerso, the outer layer of rectangular graffiti-like patterns, the triangular shape, the thickness of the glass, the size, and the typical pontil. A similar vase is illustrated in Glas in Schweden by Helmut Ricke, page 218-219. These were however made a little later than Ricke suggests - mid 1960's rather than 1950's. This is the tallest example I've seen, measuring 29cm/11.5".