This has no Scott number, since it is a poster stamp or "cinderella".
The inscription translates as:
[Top] Stamp Exposition Aschersleben 1933
[Center] Tannenberg National Monument
[Bottom] To the fallen in memory, to the living in recognition, to the future kindreds for emulation.
The handwritten bit says "Ruhestätte v[on] Hindenburg" (resting-place of Hindenburg).
According to Wikipedia:
Contrary to Hindenburg's will, he was interred with his wife in a magnificent ceremony at the Tannenberg Memorial. In 1944, as the Russians approached, Generalleutnant Oskar von Hindenburg moved his parents' remains to western Germany. After World War II the Poles razed the Tannenberg Memorial to the ground.
The remains of Hindenburg and his wife currently lie buried in St. Elizabeth's Church, Marburg.