Anyone ever seen a yellow ring PCGS holder?

I got this at Santa Clara. Pretty neat. The inter ring is really yellow and not like it was changed by heat or with the sun. Anyone else seen any like this?

Cameron Kiefer
Cameron Kiefer
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Cameron Kiefer
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Cameron Kiefer
Edited to say- Nice coin inside!
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New to me. (If anyone has one I'm interested) I wondered about the irradiation but I just don't know. From what I understand they irradiate the mail with a fairly powerful energy level and so far all of the slab type materials I've seen that have been exposed have been warped or otherwise damaged by the exposure. This doesn't seem to show anything beyond the color of the the ring.
I mentioned to Cameron by PM about one possibility. Many soft transparent plastics include a UV stabilizer is part of their formulation to keep them from yellowing when exposed to strong light. (Its a problem in the vinyl flooring industry) It may be possible that PCGS got a bad batch of rings once. I don't know. Hopefully DH can help on this one.