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Hemingray made three different styles of AM. TEL.&. TEL.CO. (American Telephone & Telegraph Company) CD 106, CD 121 and CD 190/191. The CD 106 is one of a kind. The CD 121 has several embossing variations and colors. It is important to note Hemingray was not the only glass company to manufacture the CD 121 AM Tel insulators. If you are familiar with Hemingray insulators they are easy to identify by some common hemingray characteristics. Same is true with the CD 190/191. All the Hemingray made CD 190/191s also have “TWO PIECE / TRANSPOSITION” embossed on them. Units with just AM Tel are not Hemingray made.
Always 3 pice mold. The 2 pice molds are likely Brookfield.