Welcome to the forum. I think what you have there are blisters in the copper plating, can't comment on the obverse without pictures.
In the early days of copper nickel coins the mint had a lot of issues with dies due to the harder metal. Because of this die cracks and breaks...
Well, the outer layer of a normal dime is 75% copper, so if it is at least 40%, sounds like a normal dime to me.
Yeah, that is a really poor copy, not made to fool anyone just a souvenir type replica.
The cost of grading would surpass the value of the coins. At least two are damaged, so would not grade. Not knocking them, nice old pieces of...
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