Hi Alan,

Thank you for contacting Mearto with your appraisal inquiry.
These lamps are often stamped (or labeled) with the maker's name on the shade (typically the rim) and the base. This isn't ringing any bells as to who made it so I've appraised it as by an unattributed maker so if you see any names on either the shade or base, do let me know in case it impacts the value.
If you'd like this appraisal to include dimensions, please send me - in inches - the overall height of the lamp and the greatest diameter of the shade, at your convenience.
Based on the photographs and information provided, and subject to examination, this is:

An Art Nouveau style bronze and slag glass table lamp
Probably American, mid 20th Century
With pentagonal section shade with lattice and vine decoration, over a bronze base.
[dimensions]
PROVENANCE: acquired in an online auction; previously in the collection of a Yale professor
$75-100*
*represents a fair-market value for auction purposes; retail or asking price may vary.

Please let us know if you have additional items to appraise, and thank you for using Mearto.