Here is a tough one -- an M-2052 with the unusual flared inner-most skirt. Also this insulator does not have a blue jean seam possibly indicating a maker other than Thomas. It has one chip on the outer-inner skirt (see picture) -- otherwise just two glazed over chips (factory original) - one under the top skirt and one on the outer-inner skirt which are kind of cool. Looking for $45 plus actual postage on this cool small multipart.