These unique numbers can be verified on the Beckett website. This will come with a Beckett Witness Authentication Certificate Card and matching sticker on the item. This means that a Beckett employee was present and witnessed this signing.
The certificate can also be looked up on their online database. The item "Christopher Lloyd Back To The Future 2 Doc autograph Hoverboard BAS Beckett PSA" is in sale since Wednesday, April 15, 2020.This item is in the category "Entertainment Memorabilia\Autographs-Original\Movies\Other Orig. The seller is "thedealleader" and is located in NY. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Turks and caicos islands, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Ecuador, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Liechtenstein, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Peru, Pakistan, Paraguay, Reunion, Viet nam, Uruguay.