Partly-printed DS, one page, 15 x 10, May 21, 1867. Uncommon military commission by which Abner Doubleday, as "The Commanding Officer of the Seventeenth Regiment of U.S. Infantry," appoints John McKenah as "Corporal in Company C of the Seventeenth Regiment of U.S. Infantry in the service of the United States." Crisply signed at the conclusion by Lt. Col. Doubleday and countersigned by the regiment's acting adjutant. In very good condition, with intersecting folds, overall creasing, and a stain below the signature. Accompanied by a full letter of authenticity from PSA/DNA.
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