SWA FDC colour flaw?

[JohnBenn 10]

Hi, Happy New Year (time to get back to selling/work).

 

I found these three together in a batch,and I have checked my other stock but none of them are as light as the ones on the left side of the pictures.

 

Is this common?It can't be fading.

 

Thank you

Much appreciated.

 

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