Hello Frank,i send some pictures to an expert on tiffany lamps and they told me this.
The differences in your lamp and an authentic Tiffany Studios lamp include all of the following: Wrong designs that Tiffany never used, wrong type of glass, wrong shape of the shade and no markings or incorrect markings or signatures. As you can see on my web site, all authentic Tiffany Studios lamps are signed. It will say "TIFFANY STUDIOS NEW YORK" with a number if the shade is leaded.........
We have to keep searching Frank,maybe some day we found out ho made this lamp.Thank you.