Envelope with portrait of Col. Max Friedman, commanding officer of the 5th Regiment Cavalry of Philadelphia, popularly known as the Cameron Dragoons (after Simon Cameron, President Lincoln's Secretary of War).
Content: Back flap: Entered according to act of Congress in the year 1861, by S. C. Upham, 310 Chestnut St., Philadelphia, in the Clerk's Office of the District Court of the Eastern District of Penna