Neither a maximum card, nor a first day of issue for the stamp. Simply a card inspired by King George VI:
In civil suit wearing the ribbons of his numerous decorations, the white haired King is neigboured by a stamp of Australia figuring his effigy. This 2 pence purple was issued on 4 December 1944 and designed by F.D. Manley from the same effigy in uniform as the first series of the reign in 1937.
Among many homonyms, the Maitland of the 13 August 1948 cancel, is located in South Australia.
The picture reproduced by editor Photochron is one of the many by Dorothy Wilding. It was taken for the Silver Anniversary of King George and Queen Elizabeth in 1948.
Silver anniversary that was the occasion of a stamp issue in the United Kingdom, designed from two photographs in profile of the couple. George VI profile reminds the Australia seven and a half pence issued in 1951.
To launch a study about British royal effigies on stamps...