HC Deb 08 February 1938 vol 331 c858W
Mr. Kelly

asked the Postmaster-General whether letters to China and Japan should be endorsed via Siberia or whether they should be left without any markings of destination?

Major Tryon

Letters for China and Japan intended for transmission via Siberia must be superscribed "via Siberia," otherwise they are sent by the sea routes via Suez or North America for China and via North America for Japan.