When I saw this, I thought - it's a part of some kind of crazy-looking epergne!
Christine pipped me to the post on the epergne angle.
I do think it could be an epergne part, it's the crimped trumpet, & the fact it's a piece of something makes me think so.
There were some very bizarre epergne designs in the Victorian era & they are often found in bits, too.
Part of a lamp is also possible, too.
Either that, or the glassmaker just made a random experiment to puzzle all future owners of the item! :lol: