One of my interests is the POW mail from Canada during WW2. POW mail to Germany normally passed through the German censor station in Berlin. In late 1944, due to bomb damage, the censors moved temporally to a base at Tempelhoff resulting in a change in the cachet applied. I have seen covers with the Tempelhoff cachet dated october 1944 but wondered if there is any information available about the actual dates between which this cachet was used
John