This Aqua insulator is Embossed on the (F- Skirt) PAT'D MAY 12 1891 / COLUMBIA The inside of the outer skirt is threaded. The only thing to report is a very small surface tick in middle of the glass in the rear of the right ear and a ½ inch no glass missing bruise to the inside of the inner skirt petticoat. You also will find a couple of very, very small fish eyes. In the new price guide this insulator has a value of $125-$150. Well this one can be yours for only $115.00 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 personal Check if we know you. Don't wait for a sale It's not going to happen!!