This is an authentic, highly valuable promotional movie poster for the Back to the Future Trilogy (1985–1990) featuring artwork by Drew Struzan. The poster has been extensively hand-signed by lead actors Michael J. Fox (Marty McFly) and Christopher Lloyd (Doc Brown) alongside an array of prominent supporting cast and production crew members, including Lea Thompson (Lorraine), James Tolkan (Principal Strickland), and Claudia Wells (Jennifer Parker), who added her signature with the inscription "Blessings". Elsa Raven (the "Clocktower Lady") personalized the lower edge with "Save the clock tower!", and additional production sign-offs feature special effects coordinator Kevin Pike and stuntman Jeffrey Weissman. This item was sold as Lot #497 in the high-end Propstore Entertainment Memorabilia Live Auction in Los Angeles. It comes accompanied by a matching, serialized Propstore Certificate of Authenticity (COA) tamper-evident registration card (Registration Number: COA-44A83598) signed by Adam Wilder.