Lang,
The description in my post (the instruction from the MGO in the last para) is in qoutes: it is a direct quote from the 1939 document, which is accompanied by the authorised sign viz jumping kangaroo as per Aust penny, over a single boomerang.
After that, the majority of authorised formation sign listings (of which there are many) simply state ' Kangaroo over a boomerang', without a diagram.
Mike C
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