19 Star U.S. Northern Abolitionist Exclusionary Flag, 1861.
There never was an official 19 Star flag; the 15-star 15-stripe flag served throughout 1795-1818 even though five new states (Tennessee 1796, Ohio 1803, Louisiana 1812, Indiana 1816 and Mississippi 1817) joined the Union during that period.
Click here for more details ZFC0126 Full Version