SCG3347 - Austria 2000 – 100 Years of Blood Group DiscoveryThis Austrian commemorative stamp, issued in 2000, marks the 100th anniversary of the discovery of blood groups by Austrian immunologist Karl Landsteiner in 1900. The striking modern design features the blood groups A, B, AB, and 0, creatively depicted using red blood drop motifs. The text reads "100 Jahre Entdeckung der Blutgruppen" (100 years of the discovery of blood groups). Designed by O. Stefferl, the stamp has a face value of 8 schilling and