Really need a good clear scan (not color corrected) of just the indicia and even at that with the soiling and fade you would almost have to assume the most common color. But let's see a blow up of it.
There are many ways to change colors, to create "blank denomination boxes" on GB and commonwealth stamps, etc. That is why many items should only be bought with a certificate.
I had a lovely used overprint from one of the Scandinavian countries that cataloged several thousand dollars. The cancel was over the overprint (a good sign). The overprint and cancel were both genuine but the dial of the small town (no date visible) had been replaced two years prior to the issuance of the stamp with a different font and size.
It takes a lot of research and knowing where to look to expertise a stamp properly.
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