Sir Nicholas Winton, the man who saved hundreds of Jewish children’s lives during the Holocaust, is being featured in a new set of stamps.

In 1939, Winton organized eight trains to carry 669 children who were destined for Nazi concentration camps in Czechoslovakia to London.

Winton is now featured in a set of six stamps issued by the Royal Mail in honor of some of the UK’s greatest humanitarians and their achievements. The campaign to feature the hero on the stamp was started by London’s Jewish News and it is reportedly the quickest the Royal Mail has ever confirmed a stamp nominee.

Winton died in 2015 and the age of 106.

The other two first class stamps honor Sue Ryder, who founded homes for people in need, and Nobel Prize-winning scientist Lord Boyd Orr.

The people featured on the last three stamps in the set are Quaker philanthropist Joseph Rowntree, Eglantyne Jebb, the founder of the organization that would later become Save the Children, and Josephine Butler, a woman who campaigned for women’s rights and social reform.

Winton’s heroism was unremarked until the 1980s, when his wife found evidence of the rescues. The discovery led to a reunion with some of the children and a documentary. Winton received many honors in his later years, including the knighthood. Last year, the Czech government flew him to Prague in a military plane to receive the country’s highest honor.

The Schindler reference is to the German industrialist Oskar Schindler, who is credited with saving some 1,200 Jews in the Holocaust. His story was made into an Academy Award-winning film, “Schindler’s List.”