This insulator is an earlier version of the single piece Bullers Ltd. P5065 and is of two part construction - the top two skirts are cemented onto the bottom part with sulfur cement and the large pin is cemented into the bottom with the same material. This one has a Bullers Ltd. pattern number of P8241, which is ink-stamped on to the top skirt along with the Bullers logo and a date of 1933.