Unsigned. It came from the home of a very prominent Seattle resident and there is documentation of it hanging in his dining room from a photo from 1906.
The shade measures 27" in diameter and 15" high. There are 6-sockets and also a glass-pan that permits the sockets from being seen.
The lamp is from Frederick Stimson's Queen Anne, Seattle Mansion, which is an English style house, c.1901 that had many Arts & Crafts features. The William A. French Company of St. Paul Minn was commissioned to oversee the interiors.