Here is an insulator you don't encounter very often at least I haven't, its a no name just embossed No. 20 with SDP's. You see tons of these for sale with smooth base but hardly any with the SDP's. This one is a greeny blue color, not listed, my camera makes it look light blue. Only minor issues, they are a lower wire ridge ding and dome ding and one drip half gone. Asking $35.00 U.S. + shipping. Checks preferred but will accept PayPal in family friends mode. When replying please submit your shipping address, thanks.