
Appreciate both replies the aperture is 2.7 cm internal and 4 cm external and has been
faceted inside and outside i may be thinking this might not be how it would have been
done if it were to be for something in it but that maybe wishful thinking

Must admit
though it seems almost to good for a piece of Utilitarian glass well made and heavy too.
Think its destined for the unk0nown box at some point but looks great on the window.
Thanks