Yes, I found an S-mint mart quarter a few years back in a change can at work. They didn't mint S that year for general circulation so it apparently was a proof. It's stored so I can't tell you the exact year (90s).
I found a proof quarter while CRH several months ago.
I had always wondered if I would be able to tell a proof from business strike while CRH. When I finally came across one, BAM! It just stood out. There was no doubt about what it was.
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