Looks like we got a not before date..
26/06/1953, "the first Austin made Champ arrives in Australia"
26 Jun 1953 - FIRST AUSTIN "CHAMP" US AUSTRALIA
...and we gots one for auction via the Department of Supply auction depot, Canberra -
07 May 1963 - Advertising
Now which gov dept. did it come from ?
An ex Oz army champ fer sale on ebay at the moment -
Austin Champ | eBay