The insulator on the left is a CD 155 [020] (front skirt) KERR DP1 (rear skirt) MADE IN U.S.A. 28 72 :., smooth base, mint condition, flat top, ice green. This is an unlisted color but you would probably think it was clear if you didn't have the other one next to it for comparison. $210 postpaid. The insulator on the right is a CD 155 [020] (front skirt) KERR DP1 (rear skirt) MADE IN U.S.A. 23 72 ., smooth base, mint condition, flat top, smoky clear. $200 postpaid. This is probably the one listed as clear in the price guide. I have one of each in my collection and noticed that my ice green one also has the 1972 date and three dots while my clear one has the 1972 date and one dot so the sand or glass formula must have changed just enough to make a slight color difference. These were made in Millville, NJ. Some of the later flat tops were made in Dunkirk, Indiana. $400 for the pair. PayPal, check or money order is fine. Rick Soller, 4086 Blackstone Ave., Gurnee, IL 60031.