If you knew Pete Fortier like I know Pete Fortier, you would know that his often asked question whenever he is talking insulators is: "Do you have any crude porcelain?" Notice to newbie pickers: If you ask a question often enough, eventually someone is going to say YES. I don't know the U-number off hand but this one takes one of those threadless Etheridge Patent pins. This piece was salvaged from an insulator dump by the seller.