seperation of the A and M in "America" anything special

While on line I noticed that finding a 1999 or 2000 with the A M in America seperated was a uncommon find, does this also apply to other Dates? I came across a number of different dates with this type of seperation and I was just wondering. I am sure it is very common so I just wanted be sure before I roll up these coins for new rolls. Thank you.
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Comments
I suggest checking out the various websites that discuss these and other varieties, so you know what to look for. For example, Ken Potter has a lovely website with many pictures. Go to koinpro.com.
My icon IS my coin. It is a gem 1949 FBL Franklin.