Old lamp from grandparents cottage

In the family since grandparents bought furnished cottage in the late 1930's by Lake Huron. (Was with a few other lamps I have identified, one I think is an Edward Miller iron and slag lamp.) Very heavy (iron?) base and frame, shiny greenish patina finish, painted thick glass shade. Two brass beaded pull cords for bulbs. Approximately 24" high, all original condition as far as I know, including electrical cord, works fine. Not for sale, just curious about it because I can't find any similar photos online.