Halve Dollar Search Findings. Possible Error Coin Too, Help

So I just got done searching through two boxes of half dollars and I thought I would share my findings with yal! Also, I usualy keep up to 20 AU 1971-1779's. I just do this for me, I also keep my birth year (1991), and I keep rainbow toned ones if there in really good condition. I used to keep 1976 (bicentennials), but I got up $500 worth and decided to cash them in... I find to many of them to keep. =)

In these two boxes, of 2000 halfs total, total I found:

US Silver:
1 Franklin 1962
2 Kennedy 1964
2 Kennedy 1967
2 Kennedy 1969

US Other:
20 AU 1971-79
4 rainbow toned
1 1972 gold plated
1 1991 quarter
1 AU 1991 Half
1 Possible Error Quarter

Other:
2 Foreign coins
1 Guitar Pick in g-vf condition.... lol =)

Check out the pics! Also, please share your opinions on this possible error coin. Is it just a jacked up coin or error, if it is an error, what's it worth? It seem to almost look like the bottom of another strike on the top of it.