Art Glass can be a bit hard to pinpoint as to maker, and Cir. This is a wonderful Piece, and first impression would be Murano Glass, 80% in my opinion, love the handle, I had a pieces of overshot glass that was victorian in age, that had a handle much like that. As for value, I would bet if it were I, I could get $50.00 on ebay for it, if you can prove it to be Murano, maybe a bit more, value in a shop would be up to about $100.00.