I just found a proof arizona in pocket change last week , its on another thread " found in circulation" a few days ago.
They all have " S " for the mint mark.
I deal with change everyday in my bussiness.
I have seen a few
State Quarters that are " proof like " very shiney back grounds but the cameo effect is not present high fields cameo is frosted look that contrast the mirror look making the images appear to pop off the coin