I agree with Mick.
From page 156 in DISTINGUISHING COLOUR PATCHES OF THE AUSTRALIAN MILITARY FORCES 1915 - 1951 by Keith Glyde:
"1254. 2/3rd Aust. Casualty Clearing Station, 1940-1945: Auth. Colour patch chart promulgated with AHQ(DOS) Memo No. 70030, 21.10.1940."
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