What else can I say besides what the title of this page says? EIN 020. Has smooth base and inside of inner skirt is threaded. Some smaller scattered bubbles. Just one more thing to add which you'll find below.

Book says 50-75. Have this insulator flawless insulator on your door step or on your shelf in 2-3 days once a one time payment of $65 is made. Add $5 if your address is north of the U.S. border. I accept Pal Pal in a non-fee mode or personal and money order checks as payment. I will combine shipping and give shipping discount other insulators I presently have listed for sale here at Icon. However, you better email me about this insulator first. Being I have a first email policy you wouldn't want this one to get away while you are shopping for more glass for your insulator fix!!