What happened with the type B quarters of 1956-1964 were proof dies used to strike business strike quarters at the tail-end of December for all those years to help the mint keep up to schedule on montage figures. Best way to tell a type-B reverse: the gap of the E and S of states are larger than on the regular strikes.
All dates are hard to locate, with the 1956 and 1962 being the hardest to locate, and all dates have a premium in value from marginally more valuable to very valuable of course dependent on the condition or grade of the coin.
The coins pictured above look to be actual proof strikes. If so, this type B reverse is normal for these coins. It's the business strikes with a proof reverse that carry a premium.
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