I have just started a nickel collection of high grades (post-1999 is my goal) and there are many confusions I've ran into. I will also post pictures in this thread.
>>> First of all, when I find a nickel with an unusual finish from a bankroll, how would I know if it's proof-like? Is the sharp edge the only factor?
>>> Then, there comes the grading confusion. As I was reading the population report from CCCS online, I discovered that there were both MS nickels and UNC ones graded. Any ideas on the difference?
>>> In books and websites, I have read that a MS 65 coin is allowed to have minor scartches. This fact really drive me into confusion. Maybe the following photos will aid me explain my question further:
2012 Old Style Toonie: Appears that there is only one visible scratch I could see, which is deep and noticable. How much of the grade would this problem affect?

2011 Loonie: Now major scratches but two chains of minor scratches. How would these problems affect grade?


As well as this 2000P Nickel:


What about rim damage? Dents on the rim of a coin?
This is a 2010 Nickle.


Thank you and I appreciate your time. I have many questions for my collection.