Confederacy, Libby Prison, Richmond Va., orange buff inner cover endorsed "From Libby Prison by a Prisoner of War" at left, entered mails with "Old Point Comfort Va. May 3" double-circle datestamp to Capt. Ezra Clark at Middletown Conn., Very Fine, covers actually endorsed "Libby Prison" are scarce. Estimate  $400 - 600. $0 (Image)