You said no marks, but have you checked the body of the lamp carefully for some kind of signature? They're really pretty. Hand decorated and the addition of the white, raised enamel is often indicative of touches you'd expect from Japanese production. This does not mean they're cheap, btw. Just judging on the general style, with the metal filigree base my hunch (and that is all it is) would be mid-fifties. Is is uber heavy? I suspect it is.

I have one just like it. Do you want to sell it? Let me know what you find out. Thanks

I don't think it's very old -- possibly 20 years or less. However, the glass shade MIGHT be "repurposed" from an old ceiling fixture ... or it could be original to the lamp. It's hard to tell from the photo.

Go to Ebay or an antiques site and look up Gone with the Wind lamp.