I apologize if there is already a thread for this. My dad recently came across a 1975 dime that has no "S" mark. In doing a little bit of research, we found two situations: 1) there is supposedly only two of these dimes found that are legitimate, and have been purchased for over $400k. 2) There were over 585 million made in Philadelphia mint, that seem to have no real great value.
I want to send the coin in for grading and getting a value designation to the coin, but when I saw NGC's "packages" it ranged from $19 to over $350, and for each "package" there is a ceiling limit of the value of the coin (the last tier having an "unlimited" amount. However, I do not want to pay $350+ only to have a response of "Our apologies, sir, but this coin is of the Philadelphia mint, and therefore not the valuable coin you are looking for" nor do I want to pay the $19-28 "package" and not have a response because the coin does end up being the rare one.
Any suggestions in how to proceed? Attached are pictures of the dime we have. Any help and suggestions or tips would be greatly appreciated. Thank you. Have a blessed day.