Here is one of my hoverboards that I had signed at London Film & Comicon in 2018. It has a total of 7 signatures from some of the best cast members: Christopher Lloyd (Doc Brown) Tom Wilson (Biff) Jeffrey Weissman (George McFly) Leah Thompson (Lorraine Baines) Donald Fullilove (Goldie Wilson) Claudia Wells (Jennifer Parker) Harry Tunney Waters Jr. (Marvin Berry) James Tolkan (Mr Strickland) Ricky Dean Logan (Data) I have photos of some of the signatures taking place and a photo of me with Christopher Lloyd and the hoverboard showing some of the signatures as a way of authenticity.