Help please to identify this glass (bowling ball)

Hi all,

This is probably the heaviest glass vase I have ever had but it is just gorgeous and it is staying with me

It is about 15cm wide and 11cm tall.

The opening at the top is about 4cm wide and is very rounded, this opening leads to a ball shaped concave which the brown part of the vase on the outside. This is lined in white which can only been seen if you peer inside. The brown vase is sealed inside clear glass which gives the illusion that the brown is hoovering.

The base is polished with a indented pontail.

When I purchased it there was a hand written label whivh read 668 lu,5. This might have been just a refence but just in case

Hovering not hoovering lol