Unmarked Geese & Heron Slag Glass Lamp

I bought this from an Ebay auction about 2 years ago. They claimed it to be a Miller or B&H but I could not find any stamps on it. I was rewired before I purchased it. I do not think the base and shade are original to each other but I am no expert. Just a pure guess. It is very old and a few of the metal tabs that hold the glass in place were unstable so I put some clear silicone in certain spots to ensure the glass does not slip out. It seemed very delicate and I did not want to take my chances. Can anyone tell me who could have been the maker of this lamp? I have found similar shade shapes and styles but no other Geese & Heron design. Also, I have never seen a lamp base like this one while searching the internet. Any info would be greatly appreciated. Thanks to all : )