I have found little about these lamps, hopfully the others will, they are a sharp bunch here. I still have a bit of a problem with the date 1909, not that I have any expertise in this area, but the early electric cords look thick and wrapped in cloth material if I can remember what the cords look like, I just have a pic in my head. I can not tell too much from the photo. I do find it very intresting that you would load the bulb from the bottom, can't be that big of a bulb, again I don't know by my vision of a early bulb would be much too big. I think I will go surf around and see what the early stuff look like. However the real experts will be back in the morning I'm sure