The 2 pi stamp on the right (orange colour) is normal in every way. The brownish 2 pi on the left is also normal in every way, except for the colour. The overprint appears genuine (although not professionally certified) and the stamp itself is correct, i.e., not chalk-surfaced. While I understand ‘colour changlings’, I have never seen this value in this colour and find it hard to imagine that it underwent some sort of chemical or environmental colour change. Does anyone have any opinions or information that would help to clarify?
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