How can I tell a real Tiffany lamp from a replica?

Answer 1

This may be hard for us regular people. You may be able to look for numbers and Signatures on the lamp base.
If, you feel the lamp is an old original you may try this web-site;
http://www.antiquetiffanylamps.com/?ovmkt=OBEJRKILQ0CAVMBLKITEJ7E7JG
I found it in a Search it up to you what to do. I really not know.