PCGS Proof State Quarters With Flag On Holder

Just started this set and I've noticed that some of the slabbed quarters have the state flag on the holder. Are these quarters a special series of some type? Is there any difference in value for coins with the state flag versus those without? Any help would be appreciated.
30's R Want List:
R73 1933 Goudey Indian Gum - Series 288 - Nos. 118
Also looking for 1953 Parkhurst & 1953 Quaker Oats Ripley's BION.
If you have any available for sale PM me
R73 1933 Goudey Indian Gum - Series 288 - Nos. 118
Also looking for 1953 Parkhurst & 1953 Quaker Oats Ripley's BION.
If you have any available for sale PM me
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R73 1933 Goudey Indian Gum - Series 288 - Nos. 118
Also looking for 1953 Parkhurst & 1953 Quaker Oats Ripley's BION.
If you have any available for sale PM me