(read how to identify your stamp below)
You have the 2¢ Jackson from the years 1875-1879 Unlike the earlier versions of the 2¢ Jackson, which were brown, this issue is printed in vermilion.
The stamp was printed in 1875 by the Continental Bank Note Company and then again in 1879 by the American Bank Note Company. The only way to tell them apart is that the latter was printed on soft pourous paper or it has a date cancel after February 4th 1879.. If you have the 1875 Continental printing click here. If you have the more common American Bank Note 1879 printing click here.