What search did you use in Ebay to uncover that cover you show ??. I have not been able to find anything like it but your cover does very strongly sugget or even prove that it is a Red Cross marking as that is the only thing in common between th etwo examples. Can you post a link to that lot.
I used eBay Search with "geneva censor pow". I think there were only one or two other covers with this style date marking that were found by this search. Neither were from Canada.
I am not sure that you are right in saying
The marking "PRISONER OF WAR MAIL" and it's German equivalent "KRIEGSGEFANGENENPOST" were requirements on POW mail sent to the Red Cross, as that allowed them to direct the mail to the correct department upon receipt.
as none of the other mail I have or have seen from Canada to the Red Cross has that marking. If you have any reference to that requirement I would be interested in seeing it.
As I admitted in the initial post, it has been a number of years since I spent much time looking at Red Cross mail.
Note that I limited my statement to POW mail, while much of the other censored mail seen on eBay is not marked as POW mail.
My recent investigations focus almost exclusively on mail between two internment camps in Mexico which housed some 500 German and Italian civilian internees (who had been stranded in Mexico once the war started) who were writing home during the war period via the Red Cross. That correspondence was exclusively on the standard Red Cross Message forms, in ordinary envelopes, and addressed to the Red Cross in Geneva. As these were not Prisoners of War, their mail was handled differently.
It was my aging recollection that internment camp mail to civilians via the Red Cross was handled differently by the Red Cross than ordinary POW mail for foreign POWs in the USA and our USA families writing to POWs in Germany or Italy. Much POW mail in both directions was accomplished of preprinted forms (cards or letter sheets) which were printed with all the necessary instructions.
This could be in error. I cannot cite where I developed that impression.
As to the route used, I know that some of my Mexico origin internee mail was censored in Paris, and after D-Day, some was actually censored in Berlin. As to how mail from Canada to the Red Cross might have traveled differently, that is beyond my knowledge level.
My linked cover was addressed to the Red Cross (Croce Rosa) in Geneve (Geneva), Suisse (Switzerland). I am not sure of the first word in that line, almost looks like "Hella" which I would translate as "Greece". Possible this implied that the enclosure was for a internee or prisoner or civilian in Greece.
I found the following webpage that may be of interest to anyone interested in this subject. While it focuses on the POWs in Canada writing to family at home, it reveals some of the efforts taken by Canadian authorities.
[disclaimer: I have not looked at all of it, it simply came up in a Google search and I thought readers here might find it of interest.]https://powsincanada.ca/
Also this entry, which I could not find from the home page:https://powsincanada.ca/2014/07/11/...mail-part-i/