How cool. It's called a counterstamp. There is a very popular one from the 1960s on a Lincoln Cent with Kennedy facing Lincoln. Someone made a Lincoln stamp and did the opposite in this case. Never seen it before. Nice find!
@milano113, you may know that we have a thread devoted just to counterstamps http://goccf.com/t/126486). Feel free to cross-post your Kennedy half there.
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