Found a 1999 Kennedy that is actually circulated
 commoncents123                
                
                    Posts: 2,648 ✭
commoncents123                
                
                    Posts: 2,648 ✭                
            
                    Maybe this isn't THAT unusual, but I thought it was weird to see a coin this new, that is almost never seen in circulation, this worn.  I thought this is almost down to EF status.   Is this a rare finding?  I know it's not worth anything, but still.      This also got me thinking about my next question,  what is it that actually causes coins to wear down the most?   Is it sliding them across tables and countertops thousands of times through the years, does most of the wear occur when people grab handfuls of change and toss it, coin counters? 

 
                
                
 
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<< <i>Rubbing against other coins (and keys) in pockets, change purses, car ash trays and coin jars and drawers... is my answer. >>
Bet it was a kid playing with it....
A few weeks or a couple of months in a casino may have caused the wear.
However late dates ones like your 1999 are harder to find and then are usually quite worn. Earlier dates like the 1970's are more common and have less wear. My theory is that the late date ones have spent time in the casinos. I have read that the slot machines are hard on them since payouts drop from a higher height to create a racket to impress the customers.
2 were low Unc's & one was an AU...