I'm interested to see what others think, but as far as I know, there is no difference in finish between mints on circulation coins. Perhaps you live a little closer to the Denver mint as compared to the Philadelphia mint, so those quarters had passed through a few more hands by the time they got to you?
"If you climb a good tree, you get a push." -----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed." -----King Adz
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