cover 1911 (Oct.) front registered from Yatung to England, bearing 1a. and 4a. cancelled by "YATUNG-TIBET/VIA SILIGURI" c.d.s. and showing Yatung registration h.s. and label, and circular "AR"; 1930 envelope bearing India 1a. in combination with 1912-50 t., and 1938 philtelic "BOOK POST" envelope bearing 3p. pair with Gyantse