72 vs 73 up
I think the earlier ones (blue centers) all had outties for center area while the yellow center ones were innie's. (see centers convex vs. concave). That would mean the 4 pictured above are repainted 73 and up's. I've also heard if your careful you can pop them in and out. Nothing wrong with painting up a set of yellow centers to look right, I plan to.
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Bob
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