I should have phrased my initial question as "has it been known to exist", as I do seem to have one (used). I have contacted the new "Unitrade" editor and he has requested a photo under UV. I will see if I can post it here. Neil.
Here is a photo (sorry for the blurriness) of the stamp in question. I do note that the photo does show just a light trace of tagging on the right-hand side.
I don't know the answer to whether one has ever been discovered but yours definitely has tagging. *Any* trace of or faint tagging (some issues had very light tagging) is still considered tagged.
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