Is this always the result of album storage? I love the look and have several, especially those with colorful concentric rings. Just curious.
older PCI holders sometimes give colorful concentric rings
I remember when it was called Wayte Raymond toning, which would indicate album, but original Commem holders caused it, and likely some coin doctors would cash in on anything popular. Straight graded would be my bottom line.
don't some some from mint sets, too?