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Why do you think they aren't included in the annual Uncirculated sets?
Circulation-finish JFK Halves and Golden Dollars are
also sold only in bags and rolls (with Golden Dollars, you can also order boxes that contain multiple rolls).
The U.S. Mint's definition of an Uncirculated coin (as found in the Uncirculated Mint Sets) is that it is struck on a lower-speed press with greater striking force. The Uncirculated coins are also minted and packaged in their own special area of the Mint facility (Phil. or Denver), away from the main production floor.
The circulation-finish San Francisco
ATB Quarters are not claimed to be produced in the same manner as Mint-defined Uncirculated coins, but they are of a higher overall grade than true Philly/Denver business strikes, and are basically at least equivalent to the P and D Uncirculated Quarters.