Hi Catshome,
Thank you for your response, I appreciate it!
Theoretically you could pour / use it as a caraf, but due to the weight (10 KG + the additional fluid) I think it's very unlikely it was designed for this purpose. Even for a strong person it would be hard to lift and than pour something out of without spilling.
I'm especially interested in the production technique of similar pieces, it's very thick glass and I think not every artist could sculpture a piece like this, also due to the size. Any thoughts about this, since I haven't seen any similar pieces so far.
Thank you again, I hope to get some more information about this (apparently very uncommon) piece.
Bert Peeters