MINE INSULATOR This WHITE glazed PORCELAIN insulator is embossed around the rim of the pin hole " O.B. CO. / MANSFIELD O. " small flake or two off the base. It is 3 ¾ inches tall by 3 1/8 inches wide and is a deal at only ---$25.00--- Buy with confidence! … We do not sell altered insulators! Buyer to pay all shipping and insurance costs (U.S.A. and Canadian shipping only). PayPal, Money Order, or Cashier's Check. Check our other insulators to combine freight.