I found this looking through a dealer's cache today. I was struck immediately by a few apparent details such as the thickness of the roo's tail, distortion of KG and the mint dots, and dramatic thickening of the serifs in letters throughout the reverse.
I have seen this before on American coins, where possibly a die has been heat treated between hubbings and has changed dimension. Here the expansion is pretty dramatic, resulting in thickening noted by the arrows. Notice how the the distortion displaces inward? This is my guess at least, and I'll be interested to hear a more expert analysis.
Here's one more closeup of the roo's face--actually one of the best details on this coin--a "boxing roo" perhaps? Update: this coin has since been confirmed as a "Very strong class 6, distended hub doubled die." by Coppercoins. Thanks Chuck for the info!
Eddy, yes...it appears that way, and I believe there are other doubled die Aus pennies, such as the 1962 "double nose", which I haven't yet found. The 1962 is a different type of doubled die.
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