I do not know but I would guess they will holder the pair so long as it fits within a holder they regularly use, which might be problematic depending on the length of the bios. Also you probably know that very thin paper issues tend to move around in the holder or gasket. so I'm not sure how much preservation protection is really provided by a slab.
Question though--aren't these always graded only as authentic due to their hand-cut status?
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If we are to have another contest in the near future of our national existence, I predict that the dividing line will not be Mason and Dixon's but between patriotism and intelligence on the one side, and superstition, ambition and ignorance on the other. - Ulysses S. Grant, military commander, 18th US President.
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