Just bought this from my local charity shop in the hope of it being Iittala, as the bubble looks the same as some Iittala glasses I had. The bubble has an exit hole - not enclosed.
The width is just under 20cm with a rim of 1cm thick, and the height is 9cm. It weighs 3.5kg, which made me think it unlikely to be Marks & Spencer because they don't do strong enough carrier bags for it!
Thanks in advance,
Stu.