These just came from the town of Texcoco, a city about 20 miles East of Mexico City. Embossed at front: CTC DE MEXICO SA over No 45. This was my third trip to this factory. The first in 1971 with my brother and Dad. We got some CD 155 & 106.5 Texcoco and unembossed CD 155 in olive green. The second trip provided no insulators. This November trip produced about a dozen of these. While I had the management distracted, my brother Art found them buried with other junk glass. We will have these on display at the Auburn show. Dale Huber, NIA#1358