Just came across this one in my collection. The Perf 11x11 variety is easy to identify ... from 1903. The 6d value has a small mark, but otherwise a nice stamp. Were these ever faked?
The Serrane Guide (to Forgeries), published by the APS, listed forgeries only for the first issue of New Zealand. The Guide does go beyond 1903 for other countries.
Try this link to see if anything is there, for your stamp(s):
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