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I've read that NGC's FT is tougher tan PCGS's FB, and that's the one I'm focusing on at the moment, since FT has to be FB, but FB doesn't have to be FT.
Its the same thing NGC just calls it a different name while PCGS kept the name from the Merc Dime Series.
PCGS definition is as follows:
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The PCGS "Full Bands" designation for Roosevelts requires that both the upper and lower pair of bands on the torch be distinct and show full separation. The line dividing the bands must be complete and unbroken.
Same thing as NGC they just have a different name for it.
Those pictures are hard to tell from really, need something dead on with the coin in focus. Most look good from the pictures but its also making some assumptions that strikes continued how they appear in focus.
But theres no the separation has to be good enough to get the classification. If theres complete separation its FB or FT whatever you want to call it. Theres no minimum distance it needs to be separated it just need to have clear separation.