With knobbly vases there are also Scandinavian examples to consider. I remember a while ago Ivo posted a vase he had that I think was attributed as an Aseda "Bjornevas" apologies for incorrect spelling. I attach two pictures of a Scandinavian vase, probably Aseda not CZ, this came in sommerso colours, including red and clear and violet and clear, as well as crystal. This is not a CZ piece. Magnor too made some pieces that are hotworked and can pass as possible CZ glass. The base is cut flat but there is no "chamfer" to the edge, for wont of a better term. If I was buying a Skrdlovice vase and had doubts, the absence of a "chamfer" to the edge of the cut flat base (another tiny edge of polishing to help prevent chips) could prevent me buying as most Skrdlovice has this feature on the edges of most of their pieces,
Robert (bOBA)