Here are two stamps depicting medical missionary, humanitarian and Nobel Prize winner Dr. Albert Schweitzer. The Polish stamp (Sc #2758) was issued on September 26, 1986, and the West German stamp Sc #1160) was issued on January 15, 1975.
From wikipedia, "Albert Schweitzer (1875-1965) was an Alsatian polymath (person of encyclopedic learning). He was a theologian, organist, writer, humanitarian, philosopher, and physician."

