I am aware that this will probably be impossible to ID, but still would be interested if someone has an idea...
And I am not sure if I should have posted this in the PW section; if so, I would ask one of our lovely mods to move it there

Smokey green massive glass cube, edge length 7.4 cm, cut and polished sides with bevelled edges (very nicely done), one big bubble in the centre.
On one side there is an etched mark with symbols I don't recognize; might be some company's trade mark (which would make it a promotional gift I guess).
When I googled for "glass cube" I was quite surprised that nothing similar turned up, just the usual colourless modern decorative cubes.
So is this modern Chinese, or could it be older and from a different area?
Thanks for any thoughts,
Michael