Omega Ranchero White Dial

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Gents, I bought this dial and a set of hands a couple of weeks ago.
Could you have a look them and let me know whether you see anything that would make you believe that they could not be authentic. The lume is coarsly granular, fades quickly after UV is removed. Color of the lume is best reflected on the first pic.

 
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122
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59
noone here to give me piece of advice? ;-(

Is the phosphor crumbling?

This was some flourescent dust outside of the plastic