Please read! I need help

Help! I got this at a garage sale and I cannot find the right bulb for this. I know I need 40w pearl fancy round globes, as the sticker says. But the screw in part is smaller than usual bulbs and I don't know what it's called, I bought bulbs but their screw in part is much too big. Can anyone tell me the type of screw in it is or link me to the correct bulbs pleaseeee