Is this one a Half Dollar?? They look like reeding from the edge of the coin....but that doesn't make much "cents". If you take another coin of the same type and line up the back to the front what lines up to that area? Anything that looks like it would make something like that? Speedy
Then I would have to say that it is damage from either a Coin Counting Machine or Rolling Machine! Although, Die Clashing unlike Counter Die Clashing shows up on the coin as incuse details, there is nothing on the Reverse of a Kennedy Half dollar that would account for the marks. Frank
this most likely happened at the mint though it still qualifies as "post mint damage" I believe it is caused as the coins fall off the belt into the hopper. This coin was sitting flat as the reeded edge of another coin hit it leaving "teeth" marks. I could be wrong but thats my theory. Richard