I almost gave this unsigned vase away last month, but something told me it might be good. I recently found examples on the net of what some people are claiming to be an "I Series" vase. The strange thing is that the examples online tend to be more gently curved, less sharp edge at the widest point. But the confirmed DECANTER in this series, by contrast, is sharp. So my questions are is it even Iittala? And if so, is it a Sarpaneva piece? Vintage? The color and base may provide clues. The glass itself is what I'd say medium in thickness (not super thin, but not thick), and the execution is perfect.