Pawn Stars season 14 episode 25

Episode title: Great Scott!

Turn it up to eleven with the Pawn Stars when Rick gets offered a 1973 Marshall Amp. Complete with all original parts, will it sound as rich as it looks? Then, Corey and Chum go "Back to the Future" when a hoverboard signed by the cast of the sequel comes into the shop. Will they make the item a part of their personal collection or will it float away?