CD 253 KNOWLES This is the upgrade ! (F-Skirt) KNOWLES CABLE / INSULATOR. / " PATENTED. JUNE. 17. 1890" NO issues to report on this beautiful insulator. Very seldom offered in this top shelf condition. The glass is loaded with 1000s of bubbles and cullet. It even has some AMBER in the upper glass... $125.00..,. And you will never have to upgrade it!! Buy with confidence! I ship USPS Priority Mail, with the buyer paying the actual shipping... All insulators are shipped with first $50.00 of insurance included (no cost to you the buyer). NEVER A FEE FOR "HANDLING"! Payment may be made by pay- pal or other forms. ---- WE DO NOT SELL FAKE, PAINTED, STAINED or ALTERED INSULATORS.