1927 Dr. David Hummel, Chita (8 Feb) to his wife in Sweden. Picture postcard, f.w. Russian stamp 3k + 7k but not cancelled, alongside with
1927 Dr. David Hummel, Chita (8 Feb) to his wife in Sweden. Picture postcard, f.w. Russian stamp 3k + 7k but not cancelled, alongside with T mark and Manchouli Chinese PO cds. T mark suggested that this card was posted at Manchouli where Russian stamps were not recognized. Dr. David Hummel was the zoologist of Sven Hedin expedition.1927.2.8 由Dr. David Hummel自赤塔寄瑞典的妻子。圖片明信片，貼俄國票3戈比 + 7戈比，未蓋銷。另見T章及滿州里中國郵局日戳。由於於中國郵局寄出，故不承認俄國票，判為欠資。Dr. David Hummel為斯文赫定探險團之動物學家。
