After some late-night rummaging through some pitchers I have boxed up, I'd like to add to my original opinion the possibility of it being Italian.
I found a stunted grotty brown thing that looks, overtly, nothing like your pitcher... but it is borrowing heavily from the Scandinavian style - JE Bang in particular - and has a similar thickness of glass, with a very similarly formed rim. Can't ID a maker, as it only bears a generic 'Made In Italy' export label.
So just another thought to toss into the mix.