Odd odd odd...Sorry to say but worn coins like that have almost no nuimasmatic value...that's most though...who knows yours might be an exception...I'll keep searching for it though...
Awww shucks, so I didnt got it right antedated means that the date (1815) was not the year of minting. Antedated: To assign to a date earlier than that of the actual occurrence. and the "mix and matched dies" means that the minter had (in my case 6 obverse dies and 4 reverse) dies and used them in various cobinations. (theres 10 known cobinations for my group)