Medal commemorating the discovery of penicillin. Scottish bacteriologist Alexander Fleming (1881-1955) discovered penicillin in 1928. In 1945 he shared the Nobel Prize for Physiology and Medicine with Howard Florey (1898-1968) and Ernst Chain (1906-1979), who had perfected a method of producing the volatile drug, now known to the world as antibiotics. Reverse of a medal celebrating the award of the prize.