Hemingray 60-A -- Note the No. 60 - A almost looks like 80-A, the 6 is closed completely - The 60 is over the 90 in the old stamped 1890 date...... Sloppy mold stamps---- A little harder to read the June patent on this one but sure is sloppy...The insulator is very hard to find, so I had to settle with this one. A little rough to the drips.
This is the front side of same insulator. Not a vivid Hemingray blue, but still a little color.