On August 28, 1975,  Austrian sculptor and graphic artist Fritz Wotruba died.

Fritz Wotruba (1907–1975) is considered to be one of the most important European sculptors of the twentieth century. Today he numbers among the “classics” of modern sculpture. Through his continual exhibition presence in Europe and the USA from the 1950s onward, his work received widespread international recognition. As the successful teacher of multiple generations of sculptors, he exerted a profound influence on Austrian sculpture in the postwar decades, attuning it to the developments of international modernism.
Wotruba | Belvedere Museum Vienna

Wotruba art appeared on one stamp, in May of 1975, just months before his death. .

30 years Second Republic Austria stamp
Using a piece of art from 1955
Issued by Austria Post in 1975
Artist Fritz Wotruba
The only references I could find to this work called it Austria watching two states. It alludes to Austria’s delicate position between the interests Soviet Union and the United States. If you have more information on this piece, please pop me a message.