1939 Australian Six pence , Possible Mule?

I'm not sure , I've checked Krause and it appear's that this Six Pence has the obverse of KM#38 and the reverse of KM#25 ? In the book you can see the mintmark (M) in the picture of the reverse for KM#38 clearly beneath "ADVANCE AUSTRALIA" and it is listed in the book as such.
But, when you look at the reverse of KM#25 in Krause, There is no mintmark? Can anyone enlighten me?
Is this considered a Mule


But, when you look at the reverse of KM#25 in Krause, There is no mintmark? Can anyone enlighten me?

" I just checked in , Just to see what condition, My condition was in." Kenny Rogers and the 1st. Edition......
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<< <i>But, when you look at the reverse of KM#25 in Krause, There is no mintmark? Can anyone enlighten me? >>
Not quite correct. The pic of KM# 25 (in my Krause, anyway) is of a 1918 coin, which does have the M mintmark. But, it's in a different place to the WWII US-made issues; it's below the date, rather than above.
The mintmarks (or lack thereof) aren't the difference between KM 25 and 38; the difference is only in the obverse, with the change of monarch.
Roman emperor Marcus Aurelius, "Meditations"
Apparently I have been awarded one DPOTD.