MS-66
Somewhere between XF-45 and AU-55. Better photos will help.
Not worth grading. Low grade LMCs like this aren't worth grading fees.
F-15
I didn't even look at the grade, just the originality of the surfaces. I grade it F-15.
If it has, it certainly looks market acceptable to me. I think that it's at a reasonable price.
MS-65
MS-63
MS-67
Of course, that means it's a rare gold error coin worth millions, because Dahlonega only minted gold coins, right?
I wouldn't sell it. Die polishing lines are very common, and do not affect the grade. However, if you want one with no polishing lines, go ahead...
Separate names with a comma.