Mailing envelope, 5 x 3, addressed in Custer’s hand to “Mrs. Genl. G. A. Custer, Fort Leavenworth, Kas., Per Courier.” Envelope bears a three-cent George Washington postage stamp, as well as a December 11, Hays City, postmark, and two “Postage Due” stamps. Envelope is also docketed by Mrs. Custer in pencil, “Nov. 5, 68.” In fine condition, with separated right edge and some light creasing. Pre-certified PSA/DNA and RR Auction COA.