Thats interesting, I've seen these many times, always attributed to riihimaki(sometimes Nanny Still), and I thought that's what they were, due to the sheer number of times they have been thus attributed on ebay, etc, even though they don't seem quite right for riihimaki. There is one on the whitefriars.com mistaken identities page referrred to as riihimaki. I have some really vague memory of reading a discussion about the design not referring to an eye, but to a flame. Sorry, not much help but I too will be interested to find out where it is from as I collect Riihimaen glass.