Both date stamps were withdrawn in July 1946.
Besides two additional date stamps, one also finds a few provisional date markings.
Between 1948 and 1951 the use of two further provisional date stamps had been proven. The situation deals with oval rubber date stamps with the text "POST OFFICE".
The difference between the two is found in the lower part of the date stamp. On the one the text is "RABAUL", while on the other it is "RABAUL PNG".