50's lamp

I just acquired this lamp.... when I cleaned it the metal base had inscribed serial number R800-2000-8273..... The glass looks like Murano.... swirls up with white, clear and gold.... was looking to identify manufacturer...stands 3 feet tall without harp....I did not find any other markings when I took it apart to rewire..would like to put an original shade on it, too... was thinking a fiberglass one...