Kennedy Half Dollars - Die Clash - "Overpolished Die Clash™" - And More Circulated Proofs

1996 - P Die Clash

1996 - P Die Clash with Overpolished Die, the "Overpolished Die Clash"
(note loss of detail in and around the ear, along the jawline, and in the hair)

1981 - S Circulated Proof
. . . . 
My oldest dated circulated proof yet - 1979 - filled S - Circulated Proof
. . . . 

1996 - P Die Clash with Overpolished Die, the "Overpolished Die Clash"

(note loss of detail in and around the ear, along the jawline, and in the hair)

1981 - S Circulated Proof


My oldest dated circulated proof yet - 1979 - filled S - Circulated Proof


Current maintainer of Stone's Master List of Favorite Websites // My BST transactions
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Comments
my pictures are terrible and that won't change for the foreseeable future as the timing of the mint releases is keeping money tight
Question: How common are this type of Die Clashes on Kennedy Half Dollars? I've found maybe 5 to 10 of them, but I am not sure if I just maybe wasn't observant enough in the past to catch more or not.
"Keep your malarkey filter in good operating order" -Walter Breen