Insulator has 3 embossing dates-July 1st 1882 PAT APPLIED FOR- PATENT DEC 19 1871- PATENT MAY 2 1893. Not sure on Ein. There are 5 small pings, 2 on the dome and 3 on the first wire ridge that i can see. Base has one and a half damaged drips on one side and a 1/2" chip that goes up the skirt on the opposite side that removes one whole drip and part of two others. It displays great from the 2 patent date side. Please see all 3 pictures. Asking $50 shipped. PayPal friends. Thanks