Some what uncommon triple petticoat insulator manufactured by Canadian Porcelain (CP), these were used on low voltage and sometimes phone lines in a 4 pin steel bracket set-up similar to a carrier circuit style bracket. I have a couple of these available, both have only minor damage, fleabite/peck on the base or some spots of roughness from being buried. Asking 12.00 USD+shipping (usually around $12 from Canada). PayPal no fee preferred.