Here is a really tough Mine Insulator to find in really good condition. Embossed Special Mine Insulator Jeffrey Mfg Co Columbus, Ohio Patent Sept 25, 1894. Aqua in color. Has a bruise at the front base. This creates an internal stress crack (hairline) not easily seen. Has a shallow flake at the top at mold line. Has a chip at the base of the thread which removes some glass. 7 drips chipped. Has a rear flake at the base. I have attempted to describe all damage. Reduced to $250 with free shipping if you are in the Continental US.. See my other listings.