I would strongly suspect it's been left exposed to the sun. There are traces of red still in the wording of Australia and in other areas. This stamp is a bit notorious for losing its red colour.
If it had been exposed to the sun then the other colours would have been faded in various degrees as well. Particularly the blue. and definitely the pink.
I have seen other copies, judged genuine, and they have the same undertones. Also this photo has been enlarged to show details, so, it will show details of the pink.
Anyway all opinions are always appreciated.
I will probably send it off to be expertised, and let all know the findings.
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