There is no excuse for someone to respond to you like that, not everyone around here is like that. Hang around, there are many good people on...
Looks like a plating blister, very common on the copper coated zinc cents.
All except the 1991 D dime are just damaged, the dime was struck with slightly mis aligned dies. This is quite common and carries no extra value.
That coin is badly damaged. I don't see any evidence of a doubled die, but I am sure the error experts will chime in. I see nothing to make it...
Definitely just damage.
The 1971 Two pence coin is very common. There has been a lot of false information going around about the value of the coins.
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