Star Trek 50th Anniversary &ndash; Souvenir Sheet of 2 (U.S.S. Enterprise and Klingon battle cruiser) Collectible Postage Stamps Canada Star Trek 50th Anniversary Collectible Postage Stamps Souvenir Sheet of 2 (U.S.S. Enterprise and Klingon battle cruiser) Star Trek Postage Stamps Collectible Postage Stamps Mint Never Hinged Collectible Postage Stamps