This coin was posted on a coin collecting site and one of the country's top error experts, who also authenticates errors for pcgs, has said it is just glue. The only other alternative would be to send it to one of the big three grading, authenticating services. These are ANACS, NGC and PCGS. I think PCGS you have to be a member or have a member dealer submit it. It will cost money, but it is pretty much the only way to go after one of the most esteemed experts has already given his opinion. No harassment, but if you are convinced it is something worthwhile, you are just going to have to send it to one of the big three graders.