This is what I find so fascinating about how dials age. Most attribute patina (not water ingress which is damage) to sun exposure and humid climates (again, moisture = damage), but I have seen many of the same era as my ‘72 Speedy where the lume is dark yellow to orange yet mine is still bright off white/ lemon yellow- and like my GMT, has seen heavy exposure to the elements.
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One would think if they were from the same era and properly maintained (ie all seals kept fresh) they would all age the same way, but they don’t.
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