With thanks to Wikipedia, we can tell you:  “Thomas “Tom” Crean (20th July 1877 – 27 July 1938), was an Irish seaman and Antarctic explorer from Annascaul in County Kerry. He was a member of three major expeditions to Antarctica during the Heroic Age of Antarctic Exploration, including Captain Scott’s 1911–13 Terra Nova Expedition. This saw the race to reach the South Pole lost to Roald Amundsen and ended in the deaths of Scott and his polar party. During this expedition, Crean’s 35 statute miles (56 km) solo walk across the Ross Ice Shelf to save the life of Edward Evans led to him receiving the Albert Medal for Lifesaving.”  And here he is, on an unused postcard, designed as a stamp.  Grade: 1