Collection of seven items each signed by a different X-15 pilot. Signers are: Joe Walker (commemorative cover), Forrest Petersen (FDC), Milt Thompson (commemorative cover), Robert White (signature), Joe Engle (signature), Bill Dana (commemorative cover), and Pete Knight (commemorative cover). Three of the items are encapsulated in a plastic PSA/DNA authentication holders. In fine overall condition, with some light toning to Knight’s cover. RR Auction COA.
