6XU2, Atlanta, GA, 1861 5c Black entire, hand-held 11-star flag patriotic envelope with "Fast Colors...warranted not to run" (F11-9, Slogan 33), addressed to McKinley, Alabama, "Atlanta Ga. Sep 18 1861" datestamp, cover lightly toned at top left, very fine and scarce provisional use of a patriotic envelope, 2022 Philatelic Foundation certificate (Scott $3,500)