Look at how similar the aging patterns are on these three Ed Whites:

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Note the similarity of the greenish lume, the minute and hour hand, and then the fact that the chrono hand lume is similar to each other in color, yet different from the other hands. Lends some credence to the idea bandied about that, at least for some time, the chrono hand and other two main hands may have been manufactured by different vendors.

Edited:
 
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Interesting possibility, but, I must admit... green is not in my color wheel when it comes to lume plots.
 
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Interesting possibility, but, I must admit... green is not in my color wheel when it comes to lume plots.

Yes. When it comes to esteemed lume-plot colors, green falls below beige, pumpkin, or brown. However...something to be said about original, intact, and consistent.
 
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Yes. When it comes to esteemed lume-plot colors, green falls below beige, pumpkin, or brown. However...something to be said about original, intact, and consistent.
Agree 100%
 
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Yes it is pretty typical for Ed White chrono hands to darken more than the other hands or dial in my experience. Another example.

 
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Beautiful. Stunning. I couldn't care less about the lume colour if it's all original....I'm after a '63 if any of ya'll want to sell one... PM me...
 
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My one owner-65 has the same dark orange chrono hand and dirty yellow hour/minute.