This was in a sale attributed as "Czech poss Beranek". No idea what to make of it, or who made the attribution. There is a similar shape of paperweight (good grief, it's a pear!) in the Beranek catalogue, but it's stripy and the leaf is twisted.
This one only cost a quid, so I shan't lose out.
It's 14 cm /5.5" tall to the top of the leaf. Nicely made. Polished, fllat ground base. Good quality glass, free from bubbles and inclusions.
The leaf is quite distinctive and I hope that might help identify it.