Many thanks to Mark for sharing this bit of radio history from the CBC Digital Archives:

“In February 1945, the “Voice of Canada” spoke to the world for the first time. The CBC International Service was founded to broadcast to Canadian Forces overseas in the Second World War. At war’s end the radio service focused on telling the world about Canada in over a dozen languages. Despite budget cuts and critics who accused it of employing communists or operating as a government mouthpiece, the service now called Radio Canada International has persevered. CBC Archives looks back on RCI’s six decades on shortwave.”

Based on this recording, I believe RCI used the same version of O Canada until their very last days as a shortwave broadcaster.

Click here to listen to the clip on the CBC Digital Archives site.