Everything I learned, I learned from the GMB and the very generous help of Robert Bevan-Jones, Jindrich Parik, and other passionate collectors of Czech glass here, like David and Michael. (Of course, any mistakes in my attributions are all my own.

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I don't think 'rare' is a good term to use. However, I do think your piece is desirable -- it certainly is attractive and of very good quality. A collection of different shapes must look wonderful when displayed together.