Issued in 1968, these semi-postal stamps from the Für die Jugend (“For the Youth”) series feature stylized depictions of the European badger (Dachs) and beaver (Biber). Designed with bold colors and simplified natural forms, the set exemplifies mid-century German graphic design. The surcharge amounts (15 Pf and 25 Pf) were directed to youth welfare programs, continuing a long Bundespost tradition of charity issues that blend art, nature, and social purpose. These stamps are prized by collectors for their clean lines and distinctive animal portrayals.