I don't have high hopes that this one can be identified, but I try it:
Massive blue-green bowl, 15 cm diameter, 10 cm high. 2.4 kg (!)
Indented base with nicely polished circular pontil mark.
Engraved II S to the base (so maybe a second?)
My main suspects would be Murano or Czech. (I have a similar II on some of my Skrdlovice pieces from the early sixties, but wasn't able to find a pattern match anywhere).
So if it is Murano -- which company?
Thanks for any help,
Michael