I think you diplomatically answered my question by saying that this is a controversial chip, in the 2nd. edition of the Campiglia book it is listed as "unique" 1 known survivor, if you look at the 5 dollar version of this chip the denomination side of the chip looks a little different to me than this $25 one, the type style is different, I know one thing for sure if I had the only chip in the world left I wouldn't ever sell it.
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