ca 1860s-1900s a collection of 6 official covers from the Russian Consulate to the Urga Amban, all frankless, applied with wax seal on
ca 1860s-1900s a collection of 6 official covers from the Russian Consulate to the Urga Amban, all frankless, applied with wax seal on reverse.約1860至1900年代一組六件俄國大使館寄庫倫大臣公文封，均無貼票，背面鈐火漆。
