This wavy bowl is 19cm high x 29cm x 30cm, yellow inside, brown-orange-white-yellow spotted outside, cased clear. The base is rough ground and it is signed just off the base with engraved initials, apparently JAF.
With no particular evidence to hand, Jozefina (the "art glass" operation of Krosno in Poland) springs to mind. However, this item is more attractive than much of their output, judging from images found on the internet, which might argue against that source. It seems Jozefina products typically have identifying stickers, but I canít find any information about how, if at all, their output is signed. Any insights?