It's garbage. It's corroded. It's not a Doubled Die.. I'm 50 and started studying and collecting mint errors and varieties when you were just 10 years old. Please send it and prove us wrong. I'm begging you!
Don't spend the money you envision getting for it yet. You can learn a tremendous amount here with an open mind. Let us know when you get a valid confirmation. Jim
Have a nice trip and be sure to post the results after you spend the money to have an "official" tell you what you have. We do it for free here.
Under weight is cause from acid Which also did damage to all the outer devices, including the date and mint mark
Really can't add to what has already been stated. Corrosion has caused a loss of weight, and made the surfaces rough. If you are convince you have something, I am sure the grading/attribution service would be glad to have your money! Just make sure it is money you ae willing to lose.