Hi Andrew, Thank you for contacting Mearto with your appraisal inquiry. If there were any maker's marks on this, they would be on the metal fixture (either inside or outside) at the top of the shade. If you see anything please let me know as it may increase the value. Based on the photos and information provided, and subject to examination, this is: A vintage Art Nouveau style lead and slag glass domed chandelier shade Probably American, mid 20th Century The domed shade with stylized floral decoration allover. 12 inches tall, 23 inches diameter CONDITION: appears to be in good condition PROVENANCE: acquired with a home purchase $150-250* *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 again for using Mearto.