Wallaby
My best response is that the square outline visible is the original formation sign from pre- Jan '43. After that date, the formation sign was supposed to be moved to the left guard (on the front of the vehicle). As there would have been some time for this change to be completed, this date is not conclusive. When the formation sign was moved, the old one would be painted over. I suspect that the "Wallaby" then makes his appearance as a sub-unit mascot or even as a nickname for the driver.
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