Either due to some errors or other specialties, some of the stamps have acquired super star status among their kind. Among the one-of-a-kind items include a completely original ride vehicle from Autopia. Postage stamps are repositories of history. Follow USPS on Twitter @USPS_PR and at Facebook.com/usps. It wouldn't take long for people to start collecting them. Today well take a look at the rarest and most valuable Canadian stamps. Because it was printed by an outside printer, many expected the stamp to have freaks, errors, and oddities.