1931 an Mongolian Urtuu cover and with letter sheet, applied with
Soyombo symbol in red. Late example of Urtuu
1931 an Mongolian Urtuu cover and with letter sheet, applied with
Soyombo symbol in red. Late example of Urtuu mail.
1931年一件蒙古驛站封連信紙,鈐“索永布”紅色方戳。蒙古驛站之晚期例子。