Hedin met Chiang Kai-shek in Nanjing, who thereupon became a patron of the expedition. The Sino-Swedish Expedition was honored with a Chinese postage stamp series which had a print run of 25,000. The four stamps show camels at a camp with the expedition flag and bear the Chinese text, "Postal Service of the Prosperous Middle Kingdom" and in Latin underneath, "Scientific Expedition to the Northwestern Province of China 1927–1933". A painting in the Beijing Palace Museum entitled "Nomads in the Desert" served as model for the series. Of the 25,000 sets, 4,000 were sold across the counter and 21,500 came into the possession of the expedition. Hedin used them to finance the expedition, selling them for a price of five dollars per set. The stamps were unwelcome at the time due to the high price Hedin was selling them at, but years later became valuable treasures among collectors.