I found this coin a while back, but I like it so much it bears a repeat. Take a close look at distortion of the kangaroo and lettering.
This particular coin reminds me of the US 1890 Indian Head cent DDO, with similarly blocky serifs and overall inward displacement.
According to Chuck Daughtrey at coppercoins.com, this is a class VI distended double die--thanks for that attribution! As there must be other examples, has anyone found this coin?
Compare to a normal 43-I reverse: