(United States Postal Service)

The U.S. Postal Service will unveil the two Civil War commemorative stamps for 2013 tomorrow at Gettysburg and Vicksburg, the battlefields pictured on the new Forever stamp.

In Gettysburg, the official introduction of the stamp will take place tomorrow at 11 a.m. at the Gettysburg National Military Park Museum and Visitor Center. The Vicksburg stamp will be unveiled at a 10 a.m. event at the USS Cairo Museum. The public is invited to attend both events.

The Gettysburg stamp is a reproduction of an 1887 chromolithograph by Swedish-born Thure de Thulstrup showing a cavalry advance on an infantry line. The Vicksburg stamp is a reproduction of an 1863 lithograph by Currier & Ives titled “Admiral Porter’s Fleet Running the rebel Blockade of the Mississippi at Vicksburg, April 16, 1863.”

At each ceremony, a descendant of men who fought in those battles will be present, according to a news release.