Embossed on the (F-Skirt) PATENT / JUNE 17 1890 (R-Skirt) PATENT / MAY 2 1893 This is a Hemingray product. It also has a great bubble in the glass in one ear. This style of cable insulator was susceptible to damage. This very popular insulator has the very large drip points of which only one has a very small ding otherwise this Aqua insulator is without damage…$35.00… plus postage, Buy with confidence! … We do not sell altered insulators! PayPal, or Money Order, Personal Check accepted. Check our other listings. This insulator will not go on sale.