CD 110.5 NATIONAL INSULATOR CO. [020] (Base)+NAT.INSUL.CO.+/PAT.MAY.1.DEC.25.1883 JAN.1 OCT.7.1884 BE is Aqua in color. Flat base variant which is similar to the CD 110.6 NATIONAL INSULATOR CO. 5/16-inch flat chip takes away the +N, 1/4-inch flat chip takes away part of the C in CO., 3/8-inch thin open bubble takes away the bottom part of 8, 3/8-inch section of flakes on the edge of the base takes way the bottom OC in OCT, 9/16-inch section of flat base chips takes away bottom par...t of 25 and 18 in 1883.Picture #6 is a comparison with the regular style base(right). Insulator on the left is the one featured in this auction. Please look at all pictures closely.Please check out my other auctions.I will be glad to combine items to save on shipping cost. If you win two or more items, please wait for me to send you an invoice with the combined shipping cost. Please do not use the shopping cart. I will have all invoices sent out with-in a hour after the last auction has ended. All auctions have shipping charges. If for some reason your seeing "Free Shipping" that information is incorrect. Thanks and Good Luck.