29 July 1967
This is the first stamp ever issued with a Hundertwasser design. Issued as part of a set of 25 stamps depicting modern art, Hundertwasser himself had nothing to do with its realization.
The stamps were printed in se-tenant sheets with 5 different stamps on each. The low quality of the colors and engraving make it clear that neither Hundertwasser nor Seidel had their hands in the production.