The reverse of this insulator has a noticeably lower "9" in the date "1893". If you find an example with the "9" placed unusually far to the right (below the "A" in "HEMINGRAY"), check the other side to see if it is from the exact same mold! If not, you have found a second mold with this very scarce characteristic. For more context, see the first photo and description here: [id=721390359]