Slag Lamp Help

My friend was getting rid of some old lamps, furniture, etc. I fell in love with this lamp but didn't know much about it until I started doing some research on it. I've been trying to figure out the manufacturer of this lamp. There is no apparant manufacturer mark. I found a number and a star on the bottom of it, and at the bottom of every glass panel there is is "ED". I love the lamp irregardless of who made it, but I'm just trying to figure out if I have one from a legit manufacturer or is this a knock off of some sort. Thanks!