Issued by the Republic of Austria in 1991, this 4.50 schilling stamp honors Paracelsus (1493–1541), the influential Swiss physician, alchemist, and philosopher known for pioneering medical chemistry. Designed by L. Buchheim, the stamp features a bold red and black engraved portrait framed by intricate geometric patterns. Paracelsus’ contributions to toxicology and his challenge to traditional medical practices made him a revolutionary figure in Renaissance science. This issue is a valued collectible for philatelists interested in medical history and European cultural heritage.