Large piece of glass i know nothing about, similar to a few recent posts i have put on here handle wise. I think it's crackle glass mixed with overshot glass, the pontil is hidden somewhere in the base but still sharp. Thick glass 4 mm thick with a nice ring to it.
10 3/4 inches in height, 5 1/2 inches across the base and 4 1/4 inches across the rim.