Antique/ Vintage Art Nouveau Slag Desk Lamp

Wonderful antique/vintage Gooseneck desk lamp with slag glass panels. Believe everything is original to the lamp but cord and possibly plug has been replaced at some point. I have done nothing to the lamp except enjoy it. I do not see any makers mark. But was told it was probably a R B & Co, from art nouveau period. It is heavier than it looks weighing approximately almost 6 lbs. Will package with extreme care. Measures approximately 13.5 high from top of goose neck to bottom. The base measures approximately 7.5 in length and approximately 5.5 in width. The picture with the light on also has an Amber light bulb so light might look a little more tinted.