How unlucky are you ?
My Brusden White catalogue goes to August 1990, so I cannot advise.
Opinion,
when looking at varieties using used stamps, it is fraught with problems, you have no idea of the previous journey the stamps made.
It may have been soaked in a mild bleach solution, whom knows?
With reprints, generally speaking the details do not change, just the selvedge is added with a Koala or Kangaroo etc. (sometimes in differing shades)
Your stamp in my opinion is just been chemically or light affected.
The stamp in question does not appear in Australian stamp variations Decimal 1966-2006
