This certainly seems to be my day for dredging up old covers and old mysteries.
Here is what I believe to be a really fascinating slice of history. Toward the end of WW I, the Allied governments sent an expeditionary force to Vladivostock to take control of the Pacific Terminus of the Trans-Siberian Railway. There is a well written Wikipedia article on this subject.
Part of this International Force was the Canadian Siberian Expeditionary Force (CSEF) and part of Canadian contingent was B Squadron of the Royal North West Mounted Police - RNWMP - today the RCMP.
Below is a post card that recently surfaced in family papers. It is addressed to a family member that by this time was invalided out of the army due to the 1918 flu epidemic. I researched the sender at the RCMP Depot Museum in Regina, SK, (well worth a visit if you are ever there) and discovered that it was sent by a W. Hawkes. Their records show these volunteers as having resigned from the Police in order to join the military.
Beyond the historical interest, I have a question for any military postmark specialist. I have references that show the CSEF postmark but have not run across any illustration or reference to the B Squadron marking. Any info on that? Or suggestion for a link I can try? Is it considered just an Orderly Room Stamp?