Hello @RamonSantiago! Thanks for reaching out. We would be happy to review the coin in person through our authentication and grading submission process to give our official opinion on the coin's authenticity! You can find more information on how to start submitting coins online at How to Submit. NGC uses X-ray fluorescence spectroscopy, an extensive research catalog, and other tools to determine a coin’s authenticity. If deemed not genuine, the coin is not encapsulated. NGC offers numerous educational resources to help collectors and dealers avoid counterfeit or altered coins. I've included some links below to some information we hope is helpful for you!
NGC Research Page
NGC Counterfeit Detection Resource Page