here's a very cool one i picked up today at a yard sale for a buck. fella says hes got a bunch of other insulators in storage somewhere see how that goes ; ) as seen in the pic an unlisted absolutely bubbly crystal clear 145 B [020] B on the front, B on the rear, with an A on top.one of my favourite things are the old ones in crystal clear.and see how the domes slightly offset to boot.. cool chunk of glass.