I see numerous die cracks on both sides. Nickel is a hard metal so the dies did not last long and die cracks are fairly common. I don't see any cuds on the coin.
Well done as always. I will never look at another Carver half without pausing on the word Americanism. Honestly can say that I never noticed the term on the reverse instead focusing on the map of the USA.
Early gambling machines had mints that were used as trade stimulators. No one took the mints that happened to be five cents as they tasted awful. It was a way to circumvent the laws against gambling.
The hole was likely there as they were placed on a rod which made them easier to count and sort. Transportation tokens often used a hole for sorting and storage.
What I did not know anything about was the number though it makes sense that might be a number associated with this token used in ordering them.