Mike
Are those Suillivans' marked that same on the flip? I think that is a pretty drastict difference and my gut says that is what the cause of the white vs cream back is. The question still remains if that was a intended difference or just aging. I don't think it's just aging though.
It would be great to ask anyone who might have some other ideas. I have attels that would make your sullivans' as far as colors of the back.
James G
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