EAPG Tumbler with Ice Lip

VERY RARE EAPG Tumbler with ICE LIP. The tumbler is 4" tall with a 3" diameter. The ice lip is located inside about 1" below the top edge. It actually looks like a row of teeth, but, it's purpose is to keep the ice from touching the person drinking. The glass pattern and maker is unknown. Glass has a very slight purple tint. It has a couple bubbles and straw marks. One very small mark that looks like a chip, not a chip, it's in the making. SUPER item. Definitely "one of kind".