Air mail envelope, 6.5 x 3.75, with a set of stamped lines for date, craft, and test number, signed at the bottom in blue ballpoint, “Michael Collins, Capt. USAF, Edwards AFB.” Envelope also bears a printed address to lower right as well as an October 23, 1963, Edwards, California postmark, the same month Collins was selected as part of Astronaut Group 3. In fine condition. Collins’s signing as a pilot with the inclusion of his rank is highly uncommon. Pre-certified Scott Cornish and RR Auction COA.